Oil Type Question, conventional and synthetic

Spizike231 · Feb 26, 2020

Shwaa said: ↑

Conventional is a real man's oil
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I stopped reading here cause I let out a large bearded chuckle when I read it.

That being said, I personally do Mobil Full Synthetic high mileage but I’m at 170k .

If you were at 60k on dyno I’d drain and fill with dyno.. and make the stealership pay for the oil because you told them not to change it. Run it as long as you want, switch or don’t. Your truck. Your rules.

TacoJonn · Feb 27, 2020

Accipiter13 said: ↑

A group III “Synthetic” is a more refined and hydro cracked conventional. Run the synthetic for the full 5k OEM recommend OCI and then use either synthetic or conventional for 5k from there on out. Doesn’t matter.

I’d be more worried about the “other” services they provided at a 60k interval. Most shops are total garbage. Diffs/plugs/transfluid swap?

Or did they do the typical oil change and air filter with plugs “tune-up.”

Half the time shops never bother to even grease the zerks.
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I did the Diffs/Plugs and all of these changes Toyota recommends at 60k.

robm7 · Feb 27, 2020

winkel said: ↑

Like others have said, run it. It doesn't matter if you switch back and forth or even if you mix them.
I like synthetic when it's really cold out. An engine will turn over faster in cold temps with synthetic in it but I ran dino in my old T-100 for 270,000 miles and that engine was clean inside. When I changed the valve cover gaskets at about 221,000 miles, it was remarkable how clean the top end was. I used Castro GTX pretty much exclusively in that truck. My nephew is still driving it and it's close to 300,000 miles now.
Use whatever flavor you like and change it every 5,000. You'll be fine.
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