Rethinking 5w-40 vs 15w-40 for my low use diesels

JHZR2

Staff member
Thread starter
Joined
Dec 14, 2002
Messages
47,013
Location
New Jersey
No problem as long as the pressure gauge reads at least 1 bar at idle and is pegged before the engine reaches 1500 rpm. Do you notice a difference between different oils usually?
That’s all within spec and good. But I’m still used to seeing a pegged needle at cold start until the oil all truly heats up.

TBH my OCIs are seldom, and sometimes go long durations. I’m just used to seeing a cold start pegged, even when running 5w-40.

But the pressure in use is perfectly fine, and the engine runs smooth and well.
 
Joined
Jun 12, 2020
Messages
618
Location
SW Missouri
Top