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**slo325i** · 07-10-2009, 04:27 PM

How many miles on the motor?? 5w-20 sounds a bit too thin???

**30secE30** · 07-10-2009, 04:29 PM

umm like 254,000 miles

**reelizmpro** · 07-10-2009, 04:36 PM

Too thin. 20w-50 or 15w-50 on M20 with that kind of mileage.

**nickpdx** · 07-10-2009, 04:37 PM

that oil is too thin and there's no need to use synthetic, in fact, it's probably best not to. Go with 20w50 or 15w50.

**30secE30** · 07-10-2009, 06:30 PM

but i been using synthetic since i got my car isnt it bad to change it back to conventional?

**E30 Wagen** · 07-10-2009, 06:40 PM

i would stick with synthetic then.

+1 on running 15-50, during the summer at least. I'd say that 10w-40 would be safe too.

**moatilliatta** · 07-10-2009, 07:12 PM

castrol has a 10w30 synthetic

**payney8** · 07-10-2009, 10:15 PM

10w/40 minimum

**SpecM** · 07-11-2009, 08:36 AM

mobile 1 has a 15w-50 that works very well in m20s

5w-20, even 10w-30 is too thin

the Mobile One part for the filter is M1-205 btw

**B. Tyler** · 07-11-2009, 08:51 AM

What weight would you guys recommend for an m42 with 113k on it? synthetic or not?

**Rennsport** · 07-11-2009, 09:38 AM

No, synthetic is pointless in a motor that was designed before synthetics came out. Ur just throwing money away

**SpecM** · 07-11-2009, 11:01 AM

Originally posted by Rennsport View Post

No, synthetic is pointless in a motor that was designed before synthetics came out. Ur just throwing money away

dude, sythetics "came out" in the 1940's.

Really

**Rennsport** · 07-11-2009, 11:17 AM

Originally posted by SpecM View Post

dude, sythetics "came out" in the 1940's.

Really

No shit, i ment as far as being used in engines by auto manufactures.

**rThor432** · 07-11-2009, 11:23 AM

Originally posted by reelizmpro View Post

Too thin. 20w-50 or 15w-50 on M20 with that kind of mileage.

Plus one.

And plus one to the "nothing less than 10w40" comment as well.

oil change