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Originally Posted By: zeng +1 Thanks for sharing. Btw, what's your take on my comments above dated 09/06/15 , that Merc/Northstar bearing clearances appears to be on the coarse side Compared to the Asian specs, yes. Compared to high performance domestic V8 engines, no.

Care to comment on 5W30 vs 5W40 in out of warranty GM products? Specifically a 2000 Cadillac Northstar engine.

Interesting that Chrysler DID recommend a 5W40 back then. Like I told GM customer service, oil technology has advanced in the last 22 years since the Northstar was designed. .

Originally Posted By: zeng I believe Oil Film Thickness is proportional to operating oil viscosity. Thus under identical operating conditions , xW40 would offer OP higher OFT than xW30. This should translate into higher margin of safety in terms of engine wear protection , considering the...

Originally Posted By: stchman To the OP: By running 5W-40 instead of 5W-30 do you think the engine will last longer? If the oil and filter are changed out at manufacturer's specified intervals, the engine will outlast the body. Yes, in South Florida, the engine can/does get hot in traffic...

Originally Posted By: Quattro Pete My point was that the official MB 229.5 spec does not list any other grades apart from 0w-30, 5w-30, 0w-40, and 5w-40. Correct again, and using a 229.5 oil only matters if you're in warranty. Remember, I am a factory trained dealer tech. I know about MB oil...

Originally Posted By: Quattro Pete Sure, but 229.3 is an old spec. I should have clarified that I was referring to all current production gasoline engines. Apparently exotics such as the SLR are exempted. Correct, even though they are current cars, they use the 229.3 5W50 Originally Posted...

Originally Posted By: Quattro Pete Although, they also require that an oil meets the 229.5 spec (for gasoline engines), which limits the viscosity grades that you can use. You won't find any Xw-50 or Xw-60, or 10w-XX, or 15w-XX, or 20W-XX oils on the 229.5 list. 5W50 Mobil 1 MB 229.3 is used...

Originally Posted By: KCJeep If you want to run that 5w40 by all means do so it won't hurt a thing. I wish there were a better selection of PCMO 5w40's available at good pricing, but then again that is exactly why M1 0w40 is one of the darlings here. Mobil 1 0W40 is factory fill for MB and is...

Originally Posted By: zeng Hmm ...... care to elaborate typical Mercedes clearance range for say,a 2 inch main/rod journal ? Connecting rod bearing clearance on a M119 V8 of the same period (1990-1999) as the Nortstar is .0017 to .0021 with a service limit of .0031

Got to love google, some searching and I found this Motul's 8100 X-Cess, In Detail Motul's 8100 oil begins as synthetic ester base stocks, and then has polyalphaolefin (a Group IV oil) blended in, along with proprietary additives. The combination of these means that Motul's 8100 oils maintain...

Originally Posted By: SR5 I liked how in the old days they gave you a range of viscosities based on climate. Now it's more of a one size fits all oil, which is dumbing it down. Still atleast GM says 5W30, which to me is a better default oil weight than 5W20. Mercedes still does the...

Originally Posted By: toyota62 Motul X-cess is a group3 base oil. Few years back I used it in my old Camry. I asked Motul and they said its group3 base. Then again this was 10 plus years ago. They may have changed the formula but highly unlikely That is possible, I based my information on the...

Originally Posted By: Phishin My biggest concern would be the head bolts......your N* hasn't blown a head gasket yet?? No, those are hit and miss. GM did change the block casting and used longer head bolts in the 2000 model year. 96-99 were the worst years for HG failures. And yes, I know...

As a 30 Mercedes veteran technician, I find it strange that GM insists on a 30 weight oil, whether a 5W30 or 10W30. These are the only oils recommended in the manual. Where Mercedes, with bearing clearances just as tight allows a full range of viscosities of oil ranging from 0W30 to 20W50...