Switching oils - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 04-21-2014, 10:47 AM Thread Starter
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Switching oils

I switched to rotella t6 for the winter into 7.3 and was wondering would it hurt anything to go back to the regular rotella 15w40 in the summer?

2001 f-250 ccsb lariat 4x4- mbrp 4" turboback,ts 6pos chip with gearhead tune and a leveling kit with some 305's
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post #2 of 11 (permalink) Old 04-21-2014, 11:01 AM
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Re: Switching oils

Once you go synthetic you really shouldn't go back. It's more expensive but for your truck you should still stick with full syn anyways. I run t6 year round.


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post #3 of 11 (permalink) Old 04-21-2014, 11:12 AM Thread Starter
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Re: Switching oils

If you change back what will it do or cause if I switch back?

2001 f-250 ccsb lariat 4x4- mbrp 4" turboback,ts 6pos chip with gearhead tune and a leveling kit with some 305's
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post #4 of 11 (permalink) Old 04-21-2014, 03:33 PM
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Re: Switching oils

I know that when I did that I got a really bad lope on start up. I don't know exactly what it does but I know once you use synthetic your really not suppose to go back


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post #5 of 11 (permalink) Old 04-24-2014, 06:43 AM
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Re: Switching oils

I've had it once where I ran a load of 15-40 regular thru my truck then back to 5-40 synthetic and had some weeping or mi-nute leaks on my underside driverside valve cover but other than that, leak stoped later on by itself, just a slighty differently sounding motor. Quieter with the syn.

03 F-250 7.3 XLT CC SB Auto 38R, S-B Intake, 4 inch MBRP Duals, Regulated Return, J Wood VB, DP Tuner, Isspros 3 Pillar, Terminator Scan Gauge, DS Coolant Filter, HPX
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post #6 of 11 (permalink) Old 04-24-2014, 06:53 AM
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Re: Switching oils

There's no difference but you will notice it will run different. I've been trying to get a guy I go to school with to switch to t6 for a while in the winter and he won't for some reason. Only thing going back to 15-40 is going to do is save you money because it's cheaper that 5-40syn.

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F250 7.3 Crew Cab Short Bed Lariat
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post #7 of 11 (permalink) Old 04-24-2014, 12:07 PM
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Re: Switching oils

Not really save much money as with the 15-40 when I was running it years ago I lost 120-125 mpg per tank of fuel so added up threw 6-7000 miles thats alot more in fuel then running the t6 ive been running for 3 years now year round. What I save in Every 10 tankfuls of fuel pays for my entire oil change then its profit after that till I change it again. Plus my engine sounds quieter.
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post #8 of 11 (permalink) Old 04-24-2014, 02:38 PM
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Re: Switching oils

Synthetic oil will swell the gaskets and seals a tiny bit. When you go back to regular oil this will go away. Seals will shrink, and oil will seep.
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post #9 of 11 (permalink) Old 08-01-2014, 03:39 PM
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Re: Switching oils

You are a NO-GO at this station.

00' 7.3 Power stroke.
-Afe Big Boost air filter.
-Magnaflow exhaust.
-PHP Hydra chip.
-Riffraff Compressor Wheel.
-Riffraff Fuel Rail Crossover.
Kentucky Built.
and 173,000 miles with Amsoil.

Last edited by HeavyAssault; 08-01-2014 at 08:16 PM. Reason: Non-sponsor advertising/promoting private sales
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post #10 of 11 (permalink) Old 08-01-2014, 04:12 PM
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Re: Switching oils

Another NO-GO
Attached Images
File Type: jpg amsoil_5W-40_kurt_orbahn_test_lg.jpg (25.8 KB, 57 views)

00' 7.3 Power stroke.
-Afe Big Boost air filter.
-Magnaflow exhaust.
-PHP Hydra chip.
-Riffraff Compressor Wheel.
-Riffraff Fuel Rail Crossover.
Kentucky Built.
and 173,000 miles with Amsoil.

Last edited by HeavyAssault; 08-01-2014 at 08:16 PM.
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