Oil question - sorry in advance!!
#1
Scooby Regular
Thread Starter
Oil question - sorry in advance!!
Very quick question guys, I was having my 1997 sti v3 driven 500 miles up road to me and wanted to have an oil change. Garage said they used shell fully synthetic 5w-30(even though I told them to use millers). Reading up the 10w-40 is ideally suited to the ej20. Should the 5w-30 oil be ok for 6 months or would you recommend changing as a priority?
Thbks jn advsnce
Thbks jn advsnce
Trending Topics
#8
As already said really
My rule of thumb is
Old engine that's been modded with 100k plus on has a 10/50 oil to help those worn big ends
Original unmodded engine has 10/40
My rule of thumb is
Old engine that's been modded with 100k plus on has a 10/50 oil to help those worn big ends
Original unmodded engine has 10/40
#11
Scooby Regular
iTrader: (4)
I would tend to agree with the previous comments. If it were my car i'd run good quality 10w40 in an engine that has the stock bearings still fitted and anywhere near or over 100k on the clock, and 10w50 if it's had race bearings (acl, kings etc) fitted.
From my understanding the stock bearing clearences when new are small so they can use 5w30 to reduce friction (better emissions). But at higher mileage they would have worn a bit.
Race bearings tend to run larger clearences so need a thicker oil from the off.
From my understanding the stock bearing clearences when new are small so they can use 5w30 to reduce friction (better emissions). But at higher mileage they would have worn a bit.
Race bearings tend to run larger clearences so need a thicker oil from the off.
#14
Scooby Regular
iTrader: (13)
Just to add (from info gleaned from Opie)...
I'd be inclined to use a full ester, fully synth 10W-50 for your spec.
I use Fuchs Titan Race Pro S 10w-50 in my MY1999 STi, running 384/349... Have been for nearly 7yrs now.
Millers CFS and Motul 300V equally good.
These are all top-notch oils - see posts on this page:
https://www.pistonheads.com/gassing/...&t=237642&i=60
I'd be inclined to use a full ester, fully synth 10W-50 for your spec.
I use Fuchs Titan Race Pro S 10w-50 in my MY1999 STi, running 384/349... Have been for nearly 7yrs now.
Millers CFS and Motul 300V equally good.
These are all top-notch oils - see posts on this page:
https://www.pistonheads.com/gassing/...&t=237642&i=60
Last edited by joz8968; 04 September 2017 at 12:47 PM.
#17
Scooby Regular
iTrader: (13)
- Thicker oil means more 'drag', so can result in some (negligible) power loss.
- However, as mentioned, the important bit is: in higher milage cars with more worn big-end bearings (and/or aftermarket bearings with greater tolerances), the extra thickness is designed to 'take up the slack' so to speak i.e. keep the pressure integrity 'twixt the main and b/e bearings. This is especially important when the oil thins out in a hot engine when at high rpms (especially on F.I. cars), and therefore when its more prone to any knocking which may occur.
- However, as mentioned, the important bit is: in higher milage cars with more worn big-end bearings (and/or aftermarket bearings with greater tolerances), the extra thickness is designed to 'take up the slack' so to speak i.e. keep the pressure integrity 'twixt the main and b/e bearings. This is especially important when the oil thins out in a hot engine when at high rpms (especially on F.I. cars), and therefore when its more prone to any knocking which may occur.
Last edited by joz8968; 04 September 2017 at 02:22 PM.
#18
Scooby Regular
Thread Starter
One last question!
Millers cfs nanondrive or cfs conpetitin for fast road use and the very odd track day?
Millers cfs nanondrive or cfs conpetitin for fast road use and the very odd track day?
Last edited by mellinator2k; 04 September 2017 at 02:09 PM.
#19
Scooby Regular
That nano drive CFS is nearly £70
I've always used millers 10-50 cfs never had an issue from cold to hot
I've always used millers 10-50 cfs never had an issue from cold to hot
#20
Scooby Regular
Thread Starter
Yeah ain't cheap but wonder if it is worth the extra for normal fast road use - prob not. Hoping someone can clerify. It sounds like 10-50 is the way forward regardless thanks again
#24
Scooby Regular
#27
Scooby Regular
I have good Friend called Ollie who owns a local Motorsport garage "Phoenix Motorsport" he works on them lotus Elise thingies and other fancy track cars he's a millers distributor aswell its where I get it from for the past 8 years
He looks after me really well
He also does all my alignment side of things if needed aswell
He looks after me really well
He also does all my alignment side of things if needed aswell
#28
Scooby Regular
Thread Starter
I have ordered the 10w-50 of the millers cfs nt•. Wondering if I have made the wrong choice though as it states for rally or race cars. Are any oil experts about to advise lenif it should be ok in my1997 v3 Jen sti?
Tha k you!!
Tha k you!!
#30
Scooby Regular
Thread Starter
Ha ha ok sounds like it should be compatible and will not cause more harm than it prevents lol . Thanks. Hopefully an oil expert comes along and hugs me to say everything will be fine son lol