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Engine Oil for 2006 R51 Diesel Engine
Posted: Tue Feb 12, 2019 8:26 pm
by DotanWeinstein
Hello,
I own a 2006 R51 2.5 litter dCi Paty with 276000 km
During 15000 maintenance my mechanics put a 15w40 oil. In the owner manual the recommended engine oil is 5w30.
How bad is it.
What should I do ? replace it ? flush the engine ? replace the mechanics ?
Thanks,
Dotan
Posted: Wed Feb 13, 2019 6:27 am
by underworld1001
You may get less gas mileage due to the heavier weight oil, but not sure how much less. I've seen thicker oil put in kinda as a cheap fix to quiet down an noisy engine (noisy lifters mainly), but if your engine was good to begin with, I'd stick as close to the factory oil recommendations as possible. Driving on it until you need another oil change shouldn't hurt the engine though.
Posted: Wed Feb 13, 2019 8:08 am
by smj999smj
Why not take it back to your mechanic and have them put the correct oil in it?
Posted: Wed Feb 13, 2019 11:16 am
by palmerwmd
For years 15w-40 was the recommended oil for Diesel engines.
I suspect this has only changed when gov't started measuring fuel economy as they often emphasize short range trips were thinner oils shine.
But I must agree with your mechanic that a Diesel motor in middle eastern climate should run 15w-40 the classic Diesel weight.
Also the UK website lists 15w-40 as the proper weight for a 2005 2.5L Diesel Pathfinder (for some reason it wont show me a 2006)
https://www.caarparts.co.uk/part/listing/LUBO-LU