Best motor oil to use in my 240d - Page 2 - PeachParts Mercedes-Benz Forum

Scott98 · #16 10-03-2009, 07:27 PM

Quote:

Originally Posted by LMN-

Unless they use synthetic and do regular UOA tests to ensure its running safe.

Mine is not only synthetic but a group 5 base stock synthetic at that. I did do a lab test when I had Rotella - plan on doing it with the Redline also but I haven't had to change the oil yet. I also drive only about 5k a year - hence the yearly oil change for me. Lab tests dispel all myths about oil change frequency and tell you exactly the condition of your oil.

Scott

gatorblue92 · #17 10-03-2009, 07:59 PM

Shell RotellaT 15w-40... why? cause its what i have always used... that reason is about as good as any other you will hear

bobodaclown · #18 10-03-2009, 11:18 PM

OM602 Motor. I use Rotella Synthetic, change oil and filter every 5K. Why every 5K? Cause that what's the maintenance schedule calls for.
Bobo

lupin..the..3rd · #19 10-04-2009, 10:57 AM

A 5w40 oil is great for the northeast. Good flow in the dead of winter and also stands up to hot summers. The perfect weight oil for a diesel. CD is the specified rating, but CH-4 CI-4, CI-4+, and CJ-4 are the newer standards that are most commonly found. CI-4+ is the best IMO.

My top two are Mobil 1 Turbo Diesel 5w40 and Shell Rotella T 5w40. I usually go with the Shell because it's what available close by. The Mobil 1 5w40 can be found in gallon size at most wally world stores.

NLatkovic · #20 06-08-2020, 10:31 AM

Gents - I live in an extremely hot area - Palm Springs - I stick with the MB Brand Green Stripe Diesel Oil Syn from the dealer (its actually less expensive than Mobil 1) in the cooler months here in Southern California and switch to 15W-50 Mobil 1 in the hot summer months for my 82 240D +115F in summer. Runs great and I like the feeling of sticking with OEM.

Do want to get off the reservation though and try syn Castrol or something along those lines in the near future

nelstomlinson · #21 06-08-2020, 10:59 AM

Do we know anything about suitability of oils which meet the CJ-4 spec for diesel and the SN spec for gas? I've heard they're bad for my old Fords.

H-townbenzoboy · #22 06-08-2020, 02:54 PM

Resurrected after 11 years, and an oil thread at that!

vwnate1 · #23 06-08-2020, 02:58 PM

Wow, you guys are so polite, this is a good thing .

The main thing with synthetic oils is : they pretty much stop the internal wear cycle dead wherever it is ~ my M-B's are my 'new' vehicles and everything gets synthetic Diesel (C) rated multi viscosity oils , I have some 1960's Honda air cooled Motocycles that I run flat out and they're on the original air cooled engines and still running fine no smoke and have been to Death Valley, beyond and back again .

As mentnioned : always change oil when hot and always change the filter at the same time .

Blanket mileage inervales are not useful because of the typ of driving done ~ the average daily driver idles a lot and so gets dirtier much faster, the oil doesn't wear out per se, it gets contaminated and those contaminants cause wear .

Oil analysis is great, we used in on our heavy duty over the road Diesels and yes, we extended the mileage interval .

I buy at wallymart even though I dislike that chin .

It's a financial question, buy the best quality oils you can, first synthetic and 'C' rated, then go by price wherever you have to .

JHZR2 · #24 06-08-2020, 09:53 PM

Quote:

Originally Posted by nelstomlinson

Do we know anything about suitability of oils which meet the CJ-4 spec for diesel and the SN spec for gas? I've heard they're bad for my old Fords.

The thing with later API spec oils that have lower zinc is associated with flat tapper cams with high spring pressures in old gas engines.

I asked about flat tappet cams here:

Flat Tappet Cams

Even gas engines with low spring pressures may not see issues, and our engines, even weigh a tappet if sorts, is ok with 1200ppm oils.

The issue arises when we start talking API CK-4 which no longer has the waivers for higher ZDDP in 40wt oils. Thus you can have 800ppm ZDDP content, which Is have to argue the jury is out on, and Id personally NOT use.

This also means that any dual rated API SN oils are also suspect.

Ford seems to concur:

https://jobbersworldblog.files.wordpress.com/2016/05/ford-motor-company-ck-4-position-statement.pdf?utm_source=November+2%2C+2016&utm_campaign=November+2%2C+2016&utm_medium=email

So IMO everyone does need to be careful to not to run automotive oils or low zinc diesel oils. Back in the day, the argument for/against Mobil 1 and car oils that had an API S and C rating was more related to them usually carrying lower (obsolete) C ratings for diesels, and not as much detergent/dispersant for soot. Now we have the greater challenge of lower ZDDP because even diesel engines have catalytic devices in them. So auto oils are OUT, and diesel oils must be selected with care.

The ages old Daimler viscosity chart still stands though, and a good 15w-40 or preferably 5w-40, changed hot and often is still good medicine for these cars.

Stevo · #25 06-09-2020, 04:27 PM

I have been using Amsoil 15W 40 for years and going 10 K between changes. I had an oil sample checked a couple times and no problem. I also use the Amsoil two cycle oil in my power saws, good stuff

jsb357 · #26 06-09-2020, 05:23 PM

clean oil is better than dirty oil
dirty oil is better than no oil

tdoublenastywitit · #27 06-11-2020, 12:51 AM

It literally doesn't matter

JHZR2 · #28 06-11-2020, 10:33 AM

Quote:

Originally Posted by tdoublenastywitit

It literally doesn't matter

Not true.

nelstomlinson · #29 10-15-2020, 11:29 PM

Per this sheet, Rotella T6 meets Ford spec WSS-M2C171-F1, mentioned in JHZR2's link. So do a whole slew of other oils, of course.

Screwdriva · #30 10-16-2020, 05:49 AM

With respect to all the opinions shared, I'm a 20+ owner and have obsessed over oil used in my Classic mercedes cars because I want them to last another half century.

I've tried Shell/ Chevron and several other mineral oils. The one product that actually delivered a notable, perceivable and measurable difference was Liqui Moly's MOS2 15W40 engine oil.

Instant difference was quieter start and idle, smoother low speed acceleration and a 1 mpg improvement in economy (I track and measure everything).

A few disclaimers:

1) I don't use synthetics in any Classic Mercedes engines but if I did, I would go with Amsoil.

2) I change my oil every 4K miles or less, religiously. I only use OE parts.

3) I use Auto-RX engine treatment to clean my internals and rejuvenate rubber seals before I switched to MOS2 oil. Highly recommend this before switching to improve compression and prevent or stop leaks. Follow the instructions to the letter.