Running in oil - Yanmar 3YM30

[Bob_Ranft]

Lots of info / comments on the forum regarding what oil to use in marine diesel engines. Recommended specification for the Yanmar 3YM30 is the hard to obtain mineral based API CD with a general nod to use the next one up API CF.

The Yanmar manual basically states that while one should not abuse the engine, it is best to use the engine under load at fairly high revs especially during the running in period to ensure correct bedding in of rings / bores etc. which sounds like sensible logical advice.

Anyone have any experience of using a running in oil instead of mineral based API CD or API CF to assist the initial bedding in. Are there definite advantages as claimed by running in oil suppliers - or is it all a bit of hype. Think I read somewhere that all modern cars leave factories with a grade of running in oil in the sump.

Thanks in advance

Bob

 

[vyv_cox]

The need for running-in oils died out years ago. Machining standards are now far higher than they were, with the result that bores are far closer to their final plateau finish now than used to be the case.

I'm not sure about your final sentence. I have yet to see a product that would be used for this purpose. Maybe a little higher detergency would be useful but modern lubricants are so good that this would seem unnecessary. Racing car forums seem to say the opposite - use mineral low grade oils at first, then switch to high-performance oils when running-in is complete.

 

[FullCircle]

CC/CD Single grade oils are obsolete. Here is the Shell Rotella truck blurbm, but it is valid nonetheless.

I have a 3YM30 with 800 hours and use Comma

Shell ROTELLA® T Multigrade Oils with advanced soot control
SAE 15W-40 and 10W-30
Shell ROTELLA T Multigrade SAE 15W-40 has been Shell's premium quality, heavy duty multigrade oil for all-season use by fleets with diesel power or a mix of gasoline and diesel power for the past 25 years. During that time, it has become the best selling multigrade heavy duty truck oil in the U.S. Now this product is available with advanced soot control to provide improved deposit control and improved oxidation stability.

This same premium multigrade oil is available in SAE 10W-30 grade to provide even better low temperature performance, and to satisfy the demands of engine builders who recommend lower viscosity oils.

Both viscosity grades of ROTELLA T Multigrade Oil with advanced soot control surpass the performance requirements of API CG-4, CF-4, CF, CE, CD (obsolete),, CC (obsolete), SH, and SG service classifications. They are both Mack EO-L approved and of MIL-L-46152E (obsolete) quality. The 15W-40 grade meets the requirements of the API CF 2 and CD II Service Classifications and MIL-L-2104F.

Shell ROTELLA T Multigrade Oils with advanced soot control:

Exceed performance requirements of all of today's severe high performance, fuel efficient, low emission diesel and gasoline engines
Offer superior engine protection
Flow at cold temperatures to help speed cold starts
Reduce fuel and oil consumption compared to an SAE 30 viscosity oil
For gasoline engine applications, the 15W-40 grade is an API Energy Conserving oil and the 10W-30 grade meets the API Energy Conserving II requirements. The 10W-30 grade also meets the new ILSAC GF-1 performance standard. Both oils meet the performance requirements of Allison C-4.

You can also use Castrol Lawnmowwer oil..... single grade, SAE30

http://www.nielsencdg.co.uk/acatalog/Castrol_4T_SAE30_Lawnmower_Oil_1L.html

or Classic Car from Comma

http://www.commaoil.com/productsguide/view/6/260

but I use Comma

http://www.commaoil.com/productsguide/view/6/254/H301G

when I can get it.