with my 87 420 well i'm probably the antichrist when it comes to oil and gas choices. i run regular gasoline 87 oct and not one problem or ping have i had in 18 mos of hard driving. i run castrol hi mileage 20w-50 for my oil [yes year round....but i change oil every 2500 to 3k miles with filter change]. with the engine at 80+c warm i have 1.5 bar at 500 rpm at 700 i have a solid 2 bar and the moment you bring the rpm up i got 3.

the car has the same tune on it when i got it off ebay at 3700$ arrived with 128k now has 160k. that's 32k just for commuting to work.

one point about oil pressure. pressure is fine & it is one indicator of oiling properly. the other point is oil volume. the 2 issues are not necessarily an indicator for each other. you can have decent pressure being reported but not necessarily the volume needed. this is where you've heard about only having 10 psi on hi perf motors at idle being ok. the reason is they have enough volume to sufficently oil the engine.

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Thanks Much!
Craig

1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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