5w30 - VS - 5w40?
- Thread starter DR1
- Start date
If it's gone 147K miles with 5w30, why change? The 5 is the same. The 40 is higher viscosity at operating temps, compared to 30. The engine was designed for 5w30. If the owner's manual gives 5w40 as an option, then do it, otherwise, use what the manual says.
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Short answer Yes.
Unless your owner’s manual prohibits it.
But what year truck & engine?
Unless your owner’s manual prohibits it.
But what year truck & engine?
I've never had a much truck but have had pickup trucks that take 5W30 and have used up to 5W50 with no issues.
I think he meant Mulch Truck would that change your recommendation?
You mean those that blow out mulch like,
Yes if that's a commercial diesel engine, but he made no mention of that.
Why not a 10W30 synthetic being your in Florida? Some of the cheap synthetic 10W30's have shown an impressive NOACK.
Hey! You're really getting busy on that truck! What year, model and engine do you have? You bought this used right? How many miles on it when you purchased it?
Suppose you know the oil PSI at a given RPM while at operating temperature when it was new. Personally thinking higher viscosity would bring the PSI up now. Maybe 5w40 would do that but those are two unknowns.
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I think OP meant 'my' truck and not 'much' truck, autocorrect sucks as always.
It'll be fine
Should be OK to go up one grade no problem IMO. Especially if the manual mentions it OK.
Can't pass up that deal
It would be just fine.
0W40 and 5W40 are the new 5W20 and 5W30 go to oils.
On my next oil change in the Crown Vic, I'll be switching my grade from MC 5w-20, to M1 5w-40.
$10 per qt, or $10 for all 6 qts?
