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Mixing Synthetic & Dino Oil

  • Thread starter Thread starter L-Aholic
  • Start date Start date
L

L-Aholic

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I was changing my oil and had some Rotella T 5W-40 full synthetic left over from another change and a some Castrol 10W-40. Any opinions on mixing the two? I would assume they are compatible but wanted any other opinions. I am possibly going to change over to full synthetic but wanted to ease it in and verify I do not get any leaks in the process. I have an 83 1100 8 valve motor. Thanks
 
Mix

Mix

I wouldn't mix the two except in an emergency but....a number of the guys have had good luck with the Rotella.
 
Mix away. No worry what so ever. They even sell mixed oils in the bottle.
 
I mix and switch back and forth willy-nilly between synth and dino, and have never had a problem.

Crikey, after 30 years, the urban legends surrounding synthetic oil just won't die...
 
Thanks for the replies (well most of them :-D). I completed my oil change, went for a spin and my motor has not blown up yet but the day is still early. 8-[ :)
 
I don't think it'll be a problem. I accidentally did the same in my SV1000 and called my dealer in a panic. They told me most of the Suzuki brand synthetic is actually "blend" anyway- 1/2 syn 1/2 dino.

So I'd say you'll be OK. 8-)
 
I've been mixing oils for years.

Just add clean, fresh oil when necessary to top off the crankcase, without overfilling. Mixing dino 10W40 with existing Rotella will be no problem.

The important thing is to keep the oil level where it should be, at all times.
 
The only thing I suggest you don't mix with it is alkeyhaul.
 
How bout this one.... Manuals say 10w40. I just filled with 15w40...why? Cos she seems to like it better. And its starting to get nice and warm around here. Supposed to hit 91 in the next day or so!!
 
TheCafeKid said:
How bout this one.... Manuals say 10w40. I just filled with 15w40...why? Cos she seems to like it better. And its starting to get nice and warm around here. Supposed to hit 91 in the next day or so!!
Click to expand...
And it ain't no dry heat!!!! \\:D/
 
5W40 Rotella on the 129,500-mile GK. 800-mile trip, warm temps, a half pint used. Runs great.

This oil is what I use in cold and hot weather.

But the important thing is to keep level up. Topping off 5W40 Rotella with dino 10W40 is perfectly fine. We don't leave the oil in there much longer than 2,000 miles anyway, whether dino or synthetic.
 
Exactly the same. No difference at all. I just ride, worryfree. Too many worrywarts on this forum.

I seldom let it go beyond 2,000 miles; usually I change it between 1,500 and 2,000, a wide window, depending on when it's convenient for me to do so.

Again, no difference in shifting or anything else, whether 200 miles after the change, or 2,000.
 
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