Originally Posted By: volk06
Originally Posted By: skyship
Wrong type of oil, 5/20 is not listed for this engine, it should be a 5/30 for normal use or if the engine is towing a 5/40 or even an 0/40.
I might be a Brit, but the Germans at LM think this about the oil and OCI:
Engine
· Capacity : Capacity 3,8 liter
· Use : Normal
· Intervals : Change 6 months / 5000 miles
· Products : Top Tec 4600 5W-30
: Leichtlauf High Tech 5W-40
: Longtime High Tech 5W-30
· Use : Severe
· Intervals : Change 3000 miles / 3 months / 200 hours
· Products : Top Tec 4600 5W-30
: Leichtlauf High Tech 5W-40
: Longtime High Tech 5W-30
This engine has a small sump, so 10K miles might be OTT. In economic terms Castrol GTX 5/30 or similar conventional oil changed every 5K miles with an extended use oil filter changed every 10K miles. An expensive full synthetic might make 10K in one go, but I would do a UOA at 5 and 7.5K to cross check that idea.
Whatever you do, don't throw a can of oil additives in half way to 10K as it will just cause sludge if the oil can't handle the full OCI.
Originally Posted By: TallPaul
The manual and the cap on the oil fill hole both say to use 5w20. The sump holds 4.5 quarts. I don't see where it is the wrong oil. And by using Redline, the HTHS is that of a 30 weight anyway.
Oh, the Redline site specs about 9 cst for this oil and the report came back at 11. Some thickening?
Now for another question: If iron is 54 and copper 8 at 10,000 miles, is that the same as having two 5000-mile OCIs each with iron at 27 and copper at 4?
Skyship I'm not sure where you get your oil recommendations but they are very different that what we get over here in the USA.
The truck is spec'd/back spec'd to run 5w-20.
And TallPaul, yes that is correct. The wear metals per mile is the same over those OCI.
So the US marketing folks that are keen to change their corporate average fuel consumption figures have changed the original engineering report?? Not accepted by Liqui Moly due to lack of supporting test evidence, so they stick to original specs. This is not a new engine, so why try running a thinner oil than it was designed for? I think Castrol in the UK don't agree either.