5w 40 synthetic, ok to run all year? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 03-28-2010, 07:22 AM Thread Starter
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5w 40 synthetic, ok to run all year?

i live in florida and tow 18k about once every 3 months, i'm thinking about running a thinner oil to help with starting with these tired injectors.

2000 F-350 Crewcab DW 2wd Auto
-Engine: DIY Intake, Straight pipe exhuast
-Transmission: Triple clutch billet converter, 6 gear steel planetaries, 31 row 6.0 cooler, tci deep pan
-Auto meter Tripod Gauge kit
-Truck use: Grocery getter, hauling play tows
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post #2 of 4 Old 03-28-2010, 07:43 AM
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as long as you dont have any oil leaks switching to the 5w40 syn. will help out. but if you have any minor leaks the synthetic oil will really leak.

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post #3 of 4 Old 03-28-2010, 07:53 AM
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Waste of money and no added benefit. Plus our trucks call for a 15W precursor - not a 5w. It's awfully thin for an industrial engine and as stated WILL leak more if you already have any leaks.
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post #4 of 4 Old 03-28-2010, 10:06 AM
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its not really a waste of money. especially not in cold weather i switched this winter to the 5w40 syn. and it made my cold starts 10x's smoother than with the 15w40

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