Author Topic: Motorcraft 15w40 diesel oil ok? (Read 4259 times)

mtnbob · « **on:** December 15, 2007, 09:38:53 am »

Motorcraft 15w40 diesel oil ok? It says good to 20 degrees F and it rarely gets that low here in south carolina. Anyone ever use it. I cost $10 for 5qts

jtanguay · « **Reply #1 on:** December 15, 2007, 12:38:37 pm »

no experience with it, but it should be fine considering you aren't putting it into a turbo motor. i personally would always spend the extra money for synthetic though.. that stuff goes a long long way

mtnbob · « **Reply #2 on:** December 15, 2007, 02:02:09 pm »

i'm waiting a little b4 i use synthetic, just got a rebuild. not sure how long i should wait though.

madmedix · « **Reply #3 on:** December 18, 2007, 08:25:57 pm »

I'm sure you'll hear both sides (switch now/switch later). Just go with what makes you feel comfortable? Up here, synth is required in the winter if longevity of the engine is a concern (nothin' like "square pistons" when it's -20 outside with a cold start on dino oil in the crankcase :shock: )

Cheers,
Andy

jtanguay · « **Reply #4 on:** December 19, 2007, 03:11:13 am »

my guess is that the engine might seat faster while running thick dino in the winter. either way i would want to use an oil pan heater for really cold days though... at least try and put 5000km and changing rpm's helps too (while driving)