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Old 04-08-2011, 07:00 PM
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Oil Advice

So I was having some injector stiction issues earlier on in the winter, I switched from the Motorcraft 15w40 to Rotella T5 10w30 with Rev-X additive. It worked out for the colder weather and injector issues. Now summer is around the corner and temperatures are going to be 80-100*s. I'm looking to switch to another oil.

My buddies have had good luck with Amsoil, I'm looking at their full synthetic. What is going to be the best option for my truck, between 5w40 and 15w40?

Any advice is greatly appreciated.
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Old 04-08-2011, 08:53 PM
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Quote:
Originally Posted by rajjr89 View Post
So I was having some injector stiction issues earlier on in the winter, I switched from the Motorcraft 15w40 to Rotella T5 10w30 with Rev-X additive. It worked out for the colder weather and injector issues. Now summer is around the corner and temperatures are going to be 80-100*s. I'm looking to switch to another oil.

My buddies have had good luck with Amsoil, I'm looking at their full synthetic. What is going to be the best option for my truck, between 5w40 and 15w40?

Any advice is greatly appreciated.
Well i'm running Amsoil 15w40 with a by-pass, under 20* i plug mine in and in 3 hrs my coolant temp is at 90* i may switch to a 5w40 but i need to do one more change because of the amount of oil i have left so that may be in 2012 because when i'm not pulling my 5er i use my 97 in 2 years i have only went 12k miles. Have to get my supply before the end of the month the price is going up but not as fast as diesel.
2 stroker
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Old 04-09-2011, 05:11 AM
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For years I've been running amsoil 15-40. However, I just ordered and received a case of amsoil 5-40. I usually don't run the truck in the winter months (much) but feel the 5-40 will do well year round.
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Old 04-09-2011, 05:18 AM
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Rottella or mobil 1. 4w-40 all year long.
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Old 04-09-2011, 07:43 AM
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both 15w-40 and 5w-40 are good to use in the summer over a 30w oil.

If you want to upgrade the 5w-40 syn oils, rotella is a cheap upgrade. If you want better go with mobil1.
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Old 04-09-2011, 07:51 AM
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5w40 will always be better for the injectors on a cold start. Once at operating temp there is no difference between the 5w40 and the 15w40.
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Old 04-09-2011, 08:00 AM
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Originally Posted by PGreenSVT View Post
5w40 will always be better for the injectors on a cold start. Once at operating temp there is no difference between the 5w40 and the 15w40.
Yup, and 5w-40 will be better than 10w-30 for cold starts.
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Old 04-09-2011, 08:57 AM
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Thanks for the advice, sounds like I'm going with the 5w40 then.
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Old 04-09-2011, 05:55 PM
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Ah wait, so as I'm reading it, 5w-40 is o.k. for summer temperatures in the 80-100* range?
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Old 04-09-2011, 06:32 PM
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I'm running Royal Purple 5W-40 in my 05' not had a problem to date. I am going to install an bypass filter around the same time I do my next oil change thou, just for the extra safety factor.
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