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Old 04-19-2011, 04:54 PM   #1
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Default Anyone running 10W50 or 20W50?

So i have lowish warm oil pressured due to running a non-VVT (thin) oil pump with a VVT head.

I'm talking 40 psi warm max.

So, I'm thinking of switching to xW50 oil, to improve the film strength.

Any downsides to this?
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Old 04-19-2011, 05:18 PM   #2
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Castrol 10W60 here in all race cars. Good stuff.
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Old 04-19-2011, 05:36 PM   #3
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My last oil change was 20w-50 synthetic (Valvoline), band-aid for a FUBAR'd exhaust valve. The rebuilt head arrives today, but it ran quiet & cooler with 20w50 vs Rotella T6 5w-40. Fuel mileage dropped 1-2 mpg vs the 5w-40.

I'll try to find the thread about issues with too viscous oils from BITOG, potential friction increase IIRC. Miata tolerances (PTW, bearings etc.) are typically tighter then motorcycles & rotaries, OEM 20w50 users. I'm assuming the thicker oil's minimum film thickness & slower flow might not create as constant a film?
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