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More specifically see page 2-4 of the Service Manual:
Oil pressure with oil temperature at 176°F (80°C):
At idle: 36psi
At 3,000 rpm: 85psi
Thicker oil will increase oil pressure 'cuz it's harder to push but that does not translate to oil flow which is the critical factor, not pressure. Oil needs to move. As a ridiculous example fill the crankcase with grease and you can get very high oil pressure which we know won't help the engine, In this case I'd look at the oil pump and test it with spec oil -- 10W-30 or 5W-40.
-- Chuck
PS: Please post oil analysis with the headings which show the oil brand and grade. The last incomplete sample above seems to be a 40-grade but only testing as a 30 grade. ??
oil pump failures on these cars are rare, the S2000 oil pump moves a ton of oil. When I lost my engine I ordered a new oil pump just so I had all of the parts needed and for peace of mind, but the old pump tested out fine when it was removed.
Low oil pressure readings will mostly be a faulty gauge, or worn bearings.
To the OP, I'd get the oil pan opened up asap , you may find material in the base of the pan, it will allow you to check the rods as well, so something needed either way.
Had another test about a year + 5000miles later. I have been using 10W-50 oil since then as a precaution. I also put in some liquid molly anti wear additive. I don't drive the car hard until warm, and I have done 1 track day.
The results now are much better lead is down 95%! Copper down 60%. Iron and aluminium are down 40%. Unfortunately silicon is up 35%. The air filter I am using is a berk cone filter, I have washed it and reapplied oil. I'm not sure how much I should worry about this? Silicon is used as an anti foaming agent in oil.
Wear is decreasing but still seems very high compared to averages in other cars. They may, in fact, be fine since I've not seen any universal wear standards only the averages as tested. (Hope that makes sense.)
These wear numbers are satisfactory based on what standards? As noted months ago they're well above the universal averages for wear of S2000 engines based on Blackstone Labs tests here in the US. Many are still twice the average and lead is still 7x the universal average. My tests have not showed any lead since it measured 1ppm in 2015 a year after I bought the car and started running good oil thru it.
The viscosity at 40°C is pretty useless, can't they test at 100°C and determine the operational viscosity? Assuming this is a multi grade it's testing at about 20 grade at that temp. Would be nice to see what it tests at running temperature.
Yeah hate to say it but wear on the critical components is still 300-500% that of a normal running s2000 motor, lead, copper, iron, aluminum. I'm surprised moly is still that low with the additive you put in. I guess keep running it and see if things continue to improve or the engine fails.
01-04-2021, 06:09 PM
In this case I'd look at the oil pump and test it with spec oil -- 10W-30 or 5W-40.
