Quote:
Originally Posted by ETM_Shaman
When I had the failure using 10W60 I was sure it had to do with the problem (after all, main gallery pressures changed a lot when going from 10W40 to 10W60). Then I found the GT86 CS-V3 User Manual:
https://www.racingbytmg.com/wp-conte...anual_EN-1.pdf
If you go to page 108 you'll see they use Elf HTX 825 10W-60 oil.
These cars have stock engines and are well proven so I guess the 10W60 oil is not an FA20 engine killer.
Even so I think thinner oil will allow better (closer to atmospheric) inlet pressures. I think the tests you suggest would be very interesting but to tell you the truth I don't think I'll go through the hassle of changing three different oils (including the oil cooler flush to get it all out). I had problems with 10W40, 15W50 and 10W60 oils. Always with the same clearances. I wouldn't run 0W20 oil with those clearances either, but it would also be an interesting experiment. I would've loved to have thought of the inlet pressure tap from day 1 of the first rebuild and I probably would've learned a lot and saved time and money. |
Pretty sure that closes the too heavy of oil argument.
Elf HTX 825 10W-60
Density at 15°C 0.857 g/ml ASTM D-1298
Viscosity at 40°C 160 mm²/s ASTM D-445
Viscosity at 100°C 24.5 mm²/s ASTM D-445
Viscosity HTHS 5.5 mPa.s ASTM D-4741
Flash point 242 °C ASTM D-92
Castrol TWS Motorsport (aka Edge 10w60) sold at Advanced Auto
API SJ/CF
Density: 0.864
KV@40: 161
KV@100: 24.4
VI: 179
Flash: >200C
Pour: -51C
TBN: ?
HTHS: 5.4