10W60 vs 5W30 (as per manual) Oil ?
04 April 2016, 11:06 PM
#1
10W60 vs 5W30 (as per manual) Oil ?
I see places like RCM sell oil for WRX/STI Impreza's like Castrol Edge that are 10W60.
The car manual says 5W30 is recommended.
Anyone shed any light on which to use and why 10W60 would be better?
Thanking you!
The car manual says 5W30 is recommended.
Anyone shed any light on which to use and why 10W60 would be better?
Thanking you!
05 April 2016, 08:45 AM
#4
Hi
Unfortunately there are some people that are a bit old fashioned with oil recommendations, they suggest the thickest thing, thinking it protects more. Years ago, you needed thick oils in performance cars as the oils were rubbish, you'd put in a 20w-50 and it would end up a 20w-40 or 20w-30 quite quickly, so it wasn't practical to use a thinner grade. Also, older engines have larger tolerances, so larger gaps for the oil to flow around.
Modern oils are better than the old mineral oils, so if you put in a 5w-30, it's likely to come out as a 5w-30. Also, modern engines are tighter, so thick oils do not flow well around them and it's the flow that helps to protect.
As your handbook says 5w-30, that's a sensible place to start, there are guys on here that have done well over 100k on 5w-30. If lightly modified, go for a 5w-40, or heavily modified use a 10w-50.
Cheers
Tim
Unfortunately there are some people that are a bit old fashioned with oil recommendations, they suggest the thickest thing, thinking it protects more. Years ago, you needed thick oils in performance cars as the oils were rubbish, you'd put in a 20w-50 and it would end up a 20w-40 or 20w-30 quite quickly, so it wasn't practical to use a thinner grade. Also, older engines have larger tolerances, so larger gaps for the oil to flow around.
Modern oils are better than the old mineral oils, so if you put in a 5w-30, it's likely to come out as a 5w-30. Also, modern engines are tighter, so thick oils do not flow well around them and it's the flow that helps to protect.
As your handbook says 5w-30, that's a sensible place to start, there are guys on here that have done well over 100k on 5w-30. If lightly modified, go for a 5w-40, or heavily modified use a 10w-50.
Cheers
Tim
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05 April 2016, 12:48 PM
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Hi
Unfortunately there are some people that are a bit old fashioned with oil recommendations, they suggest the thickest thing, thinking it protects more. Years ago, you needed thick oils in performance cars as the oils were rubbish, you'd put in a 20w-50 and it would end up a 20w-40 or 20w-30 quite quickly, so it wasn't practical to use a thinner grade. Also, older engines have larger tolerances, so larger gaps for the oil to flow around.
Modern oils are better than the old mineral oils, so if you put in a 5w-30, it's likely to come out as a 5w-30. Also, modern engines are tighter, so thick oils do not flow well around them and it's the flow that helps to protect.
As your handbook says 5w-30, that's a sensible place to start, there are guys on here that have done well over 100k on 5w-30. If lightly modified, go for a 5w-40, or heavily modified use a 10w-50.
Cheers
Tim
Unfortunately there are some people that are a bit old fashioned with oil recommendations, they suggest the thickest thing, thinking it protects more. Years ago, you needed thick oils in performance cars as the oils were rubbish, you'd put in a 20w-50 and it would end up a 20w-40 or 20w-30 quite quickly, so it wasn't practical to use a thinner grade. Also, older engines have larger tolerances, so larger gaps for the oil to flow around.
Modern oils are better than the old mineral oils, so if you put in a 5w-30, it's likely to come out as a 5w-30. Also, modern engines are tighter, so thick oils do not flow well around them and it's the flow that helps to protect.
As your handbook says 5w-30, that's a sensible place to start, there are guys on here that have done well over 100k on 5w-30. If lightly modified, go for a 5w-40, or heavily modified use a 10w-50.
Cheers
Tim
Last edited by kshoughton; 05 April 2016 at 12:51 PM.
05 April 2016, 12:56 PM
#10
Hi
Who was it that recommended it?
Sometimes we get someone who says 'I want a 10w-60 for my Impreza' and some of the guys that don't do recommendations sell it. If it was me ( I take most of the calls about oils) I either didn't know it was for an Impreza or there was a reason for using it (like fuel dilution). Unless your engine was either suffering from fuel dilution or high oil consumption, I would have recommended a 10w-50 in it.
Cheers
Tim
Who was it that recommended it?
Sometimes we get someone who says 'I want a 10w-60 for my Impreza' and some of the guys that don't do recommendations sell it. If it was me ( I take most of the calls about oils) I either didn't know it was for an Impreza or there was a reason for using it (like fuel dilution). Unless your engine was either suffering from fuel dilution or high oil consumption, I would have recommended a 10w-50 in it.
Cheers
Tim
05 April 2016, 01:02 PM
#11
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Hi
Who was it that recommended it?
Sometimes we get someone who says 'I want a 10w-60 for my Impreza' and some of the guys that don't do recommendations sell it. If it was me ( I take most of the calls about oils) I either didn't know it was for an Impreza or there was a reason for using it (like fuel dilution). Unless your engine was either suffering from fuel dilution or high oil consumption, I would have recommended a 10w-50 in it.
Cheers
Tim
Who was it that recommended it?
Sometimes we get someone who says 'I want a 10w-60 for my Impreza' and some of the guys that don't do recommendations sell it. If it was me ( I take most of the calls about oils) I either didn't know it was for an Impreza or there was a reason for using it (like fuel dilution). Unless your engine was either suffering from fuel dilution or high oil consumption, I would have recommended a 10w-50 in it.
Cheers
Tim
Last edited by kshoughton; 05 April 2016 at 01:49 PM.
05 April 2016, 01:06 PM
#12
Hi
I have no idea who recommended a 10w-60, or why they would have done. 10w-40 Millers CRO is ideal for the running in.
It's not that the 10w-60 is unsafe in yours, but a 10w-50 is better. If you let me have the order details, I'll get the two cans of 10w-60 swapped for the 10w-50.
Cheers
Tim
I have no idea who recommended a 10w-60, or why they would have done. 10w-40 Millers CRO is ideal for the running in.
It's not that the 10w-60 is unsafe in yours, but a 10w-50 is better. If you let me have the order details, I'll get the two cans of 10w-60 swapped for the 10w-50.
Cheers
Tim
05 April 2016, 01:53 PM
#13
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Hi
I have no idea who recommended a 10w-60, or why they would have done. 10w-40 Millers CRO is ideal for the running in.
It's not that the 10w-60 is unsafe in yours, but a 10w-50 is better. If you let me have the order details, I'll get the two cans of 10w-60 swapped for the 10w-50.
Cheers
Tim
I have no idea who recommended a 10w-60, or why they would have done. 10w-40 Millers CRO is ideal for the running in.
It's not that the 10w-60 is unsafe in yours, but a 10w-50 is better. If you let me have the order details, I'll get the two cans of 10w-60 swapped for the 10w-50.
Cheers
Tim
27 May 2023, 07:25 AM
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Hi
Unfortunately there are some people that are a bit old fashioned with oil recommendations, they suggest the thickest thing, thinking it protects more. Years ago, you needed thick oils in performance cars as the oils were rubbish, you'd put in a 20w-50 and it would end up a 20w-40 or 20w-30 quite quickly, so it wasn't practical to use a thinner grade. Also, older engines have larger tolerances, so larger gaps for the oil to flow around.
Modern oils are better than the old mineral oils, so if you put in a 5w-30, it's likely to come out as a 5w-30. Also, modern engines are tighter, so thick oils do not flow well around them and it's the flow that helps to protect.
As your handbook says 5w-30, that's a sensible place to start, there are guys on here that have done well over 100k on 5w-30. If lightly modified, go for a 5w-40, or heavily modified use a 10w-50.
Cheers
Tim
Unfortunately there are some people that are a bit old fashioned with oil recommendations, they suggest the thickest thing, thinking it protects more. Years ago, you needed thick oils in performance cars as the oils were rubbish, you'd put in a 20w-50 and it would end up a 20w-40 or 20w-30 quite quickly, so it wasn't practical to use a thinner grade. Also, older engines have larger tolerances, so larger gaps for the oil to flow around.
Modern oils are better than the old mineral oils, so if you put in a 5w-30, it's likely to come out as a 5w-30. Also, modern engines are tighter, so thick oils do not flow well around them and it's the flow that helps to protect.
As your handbook says 5w-30, that's a sensible place to start, there are guys on here that have done well over 100k on 5w-30. If lightly modified, go for a 5w-40, or heavily modified use a 10w-50.
Cheers
Tim
I have a 2018 WRX STI which is stock for now, but is gonna be running around 360BHP by the end of the year. I am currently running some Motul 300V 10W60 (which I, by reading this topic, understood was a mistake). It is my daily driver and I live in the swiss Alps, therefore I regularly (5-10x/month) drive mountain passes (between 10-25 min of pretty hard driving). When I'll be running the 360BHP, it'll have an IAG competion oil pan, a mishimoto oil cooler and a koyorad radiator. With all of that in mind, what grade oil would recommend (gonna go with Motul 300V) : 5W30 ; 5W40 ; 5W50 ?
Quentin Guilbaud
Last edited by SPQR_GuiGui; 27 May 2023 at 07:26 AM.
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