Originally Posted by ARCOgraphite
Originally Posted by jbutch
Originally Posted by ARCOgraphite
I would only use it in the saab or the pathfinder.
The other engine are viscosity sensitive due to the VVT cam phasers and light reciprocating components AND oil cooling requirement.
My Subaru FB engine didn't really like a thick 5W 20 grade in it during the summer
This is tried and tested, not sitting around a keyboard just
guessing
In the summer time, there is no way a 5w-20 would behave differently than a 0w-20.
Here we go with blanket statement again with no data or experience.
I just TOLD you it did.
I drove the car, ride in the car on trips an I noticed the difference. It was easily drivable, but didn't rev as eagerly, a little bit sluggish - but quieter running when hot.
Are you aware that Japanese 0W20 are directed at fuel conservation and high efficiency? Moreseo than 5W?
They tend to be formulated closer to the BOTTOM of the 20 grade range. whereas 5W20 are near the TOP of the 20 grade range.
Suabru idemitsu KV40 is ~ 37 cSt
KV100 is ~7.8
Here is (plain vanilla) Mobil 1 5W20
Viscosity @ 100ºC, cSt (ASTM D445) 8.9
Viscosity, @ 40ºC, cSt (ASTM D445) 49.8
Viscosity Index 160
Recall that this engine oil temp runs well below boiling; Around 77C
I do have a FA20F engine that is similar to the FB series and I have tried many engine oils KV ranging from 9.8 cst @100c to 12.1 cst @ 100c and the engine is running better imo with the thicker oil and also had better UOAs.
I checked a few 0w-20 (RGT, PP, QSUD) and they were all 8.3 cst @ 100c and up. Their 5w-20 version has the same or very close cst @ 100c.
Maybe your engine didn't like the additives in the 5w-20 you tried?
My FA20F runs at 90C to 100C and I have a friend that has a FB20 and it runs even hotter at over 100C on the highway.
Originally Posted by ARCOgraphite
Originally Posted by jbutch
In the summer time, there is no way a 5w-20 would behave differently than a 0w-20.
I apologize, I was too harsh in my reply above.
I had just finished a double tea an got a bit irritated.
+
No worries, it happens to the best of us.
I should have added that I do have some experience with a similar engine and that I did try a few oils.