What oil to use? 2003 sti
18 January 2012, 08:38 PM
#31
The Millers is 100% synthetic, a lot of the 'fully' synthetic oils only contain a small percentage of synthetic components. Millers is composed of a triple ester formula which is more advanced than cheaper oils.
BENEFITS: • Fully synthetic oils provide many outstanding performance benefits over conventional mineral oil. • By utilising both polyalphaolefins (PAO) and ester synthetics specially selected to minimise the amount of polymer used, the lubricant film provided is more resistant to ‘shear’ and viscosity loss in highly stress areas. Full synthetic oil provides: • Load carrying capacity many times that of mineral oil. • High film strength for ultimate protection. • Outstanding cold flow properties for reduced wear at start up excellent thermal stability and oxidation resistance. • The synergistic blend of three esters gives improved lubricity, reducing friction and enhancing the oils performance. • CFS 10w40 additive technology is formulated to protect high revving competition engines from modern 16-valve twin OHC to older pushrod OHV engines. PERFORMANCE PROFILE: • Manufactured to far exceed the requirements of API SL/CF and ACEA A3/B4. • For fast road use or track days in engines where a 5w40 is normally specified. • Suitable for operating at 125°C with peak temperatures up to 150°C. TYPICAL CHARACTERISTICS: SAE Viscosity Grade ... 10w40 Specific Gravity @ 15°C ... 0.867 Kinematic Viscosity @ 100°C ... 15.6cSt Kinematic Viscosity @ 40°C ... 90cSt Viscosity Index ... 185 Pour Point °C ... -25 Flashpoint °C ... 210 Cold Crank Viscosity @ -25°C ... 7,000cP
BENEFITS: • Fully synthetic oils provide many outstanding performance benefits over conventional mineral oil. • By utilising both polyalphaolefins (PAO) and ester synthetics specially selected to minimise the amount of polymer used, the lubricant film provided is more resistant to ‘shear’ and viscosity loss in highly stress areas. Full synthetic oil provides: • Load carrying capacity many times that of mineral oil. • High film strength for ultimate protection. • Outstanding cold flow properties for reduced wear at start up excellent thermal stability and oxidation resistance. • The synergistic blend of three esters gives improved lubricity, reducing friction and enhancing the oils performance. • CFS 10w40 additive technology is formulated to protect high revving competition engines from modern 16-valve twin OHC to older pushrod OHV engines. PERFORMANCE PROFILE: • Manufactured to far exceed the requirements of API SL/CF and ACEA A3/B4. • For fast road use or track days in engines where a 5w40 is normally specified. • Suitable for operating at 125°C with peak temperatures up to 150°C. TYPICAL CHARACTERISTICS: SAE Viscosity Grade ... 10w40 Specific Gravity @ 15°C ... 0.867 Kinematic Viscosity @ 100°C ... 15.6cSt Kinematic Viscosity @ 40°C ... 90cSt Viscosity Index ... 185 Pour Point °C ... -25 Flashpoint °C ... 210 Cold Crank Viscosity @ -25°C ... 7,000cP
18 January 2012, 11:10 PM
#32
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You're right, it is due to temps, I just try to keep things simple and so many people that we deal with have absolutely no idea how hot their oil is getting. If someone lets me know oil temps, I base my answers on that. I did say if the car is getting tracked a 10w-50 would be better, a 5w-40 for road use and that is due to temps.
If an oil is made to be thin when cold and thick when hot, a lot of additives are needed. The action of the engine cuts (shears) the polymers used and the viscosity gap is reduced, ie a 5w-50 is likely to become a 5w-40 or 10w-40 quite quickly, same with a 10w-60. The most stable oils have a small viscosity gap, so if a car wants a SAE50 when hot, I'd tend to recommend a 10w-50 for mainly road use and a 15w-50 if it's mainly a track car.
Cheers
Tim
If an oil is made to be thin when cold and thick when hot, a lot of additives are needed. The action of the engine cuts (shears) the polymers used and the viscosity gap is reduced, ie a 5w-50 is likely to become a 5w-40 or 10w-40 quite quickly, same with a 10w-60. The most stable oils have a small viscosity gap, so if a car wants a SAE50 when hot, I'd tend to recommend a 10w-50 for mainly road use and a 15w-50 if it's mainly a track car.
Cheers
Tim
19 January 2012, 08:58 AM
#33
All filters do is stop large bits of debris, so as long as they filter enough and have a high enough flow rate, they are fine for the car. The UFI and Mahle ones we have meet or exceed the OEM requirements. The K&N ones are popular as well, for a performance filter they are well priced.
Cheers
Tim
21 March 2016, 01:44 AM
#34
You're right, it is due to temps, I just try to keep things simple and so many people that we deal with have absolutely no idea how hot their oil is getting. If someone lets me know oil temps, I base my answers on that. I did say if the car is getting tracked a 10w-50 would be better, a 5w-40 for road use and that is due to temps.
If an oil is made to be thin when cold and thick when hot, a lot of additives are needed. The action of the engine cuts (shears) the polymers used and the viscosity gap is reduced, ie a 5w-50 is likely to become a 5w-40 or 10w-40 quite quickly, same with a 10w-60. The most stable oils have a small viscosity gap, so if a car wants a SAE50 when hot, I'd tend to recommend a 10w-50 for mainly road use and a 15w-50 if it's mainly a track car.
Cheers
Tim
If an oil is made to be thin when cold and thick when hot, a lot of additives are needed. The action of the engine cuts (shears) the polymers used and the viscosity gap is reduced, ie a 5w-50 is likely to become a 5w-40 or 10w-40 quite quickly, same with a 10w-60. The most stable oils have a small viscosity gap, so if a car wants a SAE50 when hot, I'd tend to recommend a 10w-50 for mainly road use and a 15w-50 if it's mainly a track car.
Cheers
Tim
My 95 classic runs at 90 degrees oil temp at moderate cruise with a 10/40 oil running 340 bhp
Time to go to 10/50 ?? I'm noticing at 90 degrees plus oil pressure dropping at idle and cruise by about 1/4 bar
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