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Shell Rotella Synthetic vs. GTX 20w-50 mineral, which is best?

I'm trying to pick the best oil I can get for my '87 Carrera at a reasonable price at you know where, WalMart. I've narrowed the selection to just Shell Rotella Synthetic and Castrol GTX 20W-50 Mineral. I usually change oil at less than 4,000mi and I occassionally do some spirited driving, (So. Calif.). I don't baby it, I feel it's meant to be used for what is was intended. You wouldn't use an Bf 109g for crop dusting. So what's the best of the two?
Old 10-28-2005, 10:48 PM
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I have heard,(for what it's worth), that there are some longevity/durability issues with the Rotella. This was from a high performance motorcycle guy.
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Old 10-29-2005, 05:17 AM
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Re: Shell Rotella Synthetic vs. GTX 20w-50 mineral, which is best?

Quote:
Originally posted by movin
I'm trying to pick the best oil I can get for my '87 Carrera at a reasonable price at you know where, WalMart. I've narrowed the selection to just Shell Rotella Synthetic and Castrol GTX 20W-50 Mineral. I usually change oil at less than 4,000mi and I occassionally do some spirited driving, (So. Calif.). I don't baby it, I feel it's meant to be used for what is was intended. You wouldn't use an Bf 109g for crop dusting. So what's the best of the two?
The Rotella probably, no almost certainly, has better specs on paper but that does not neccesarily mean it is better for your car. You mentioned a few items about your driving style but I didn't see where you mentioned the year, mileage, condition of your car, your miles per week, and/or your intended drain interval all of which make a difference on which product would be better for your application. Let us know that and I'll give you my slightly educated opinion.

Don
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Old 10-29-2005, 05:34 AM
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movin,

There was a looong, extensive thread on oil "hosted" largely by Mike (aka lubemaster77), resident oil expert (or I consider him an expert, as he is IN the field). IIRC, someone asked the question regarding Rotella and Mike said it was "ok" but seemed to imply that GTX was the better one to use. I'm working off memory here, so make sure you check it out to get the real goods.

Try this link:

Engine Oil Selection - Why and What (TF), long!

Edward
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Old 10-29-2005, 07:11 AM
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That was my recollection too, that Rotella has some issues or negative reputation that GTX didn't have. On paper the Rotella seems impressive and forget Castrol they don't post spec's on their site, seems silly not to, what are they hiding? I'm still leaning to GTX.
Old 10-29-2005, 09:22 AM
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I think we're all looking for the holy grail on oil. Afterall, these cars are special to us and we all want to treat them to the very best and get the most performance/longevity out of our sports-car investment. But if we change the oil and replace with good filters at reasonable intervals (that translates to "frequent" to us car freaks ), I would hasten to say that any good mainstream oil will do no harm, and that "better" (read: pricey) oil may not yield any discernable benefit (again, given our typically short change intervals). Sure, longer change intervals and higher-stresses like track cars would likely be better candidates for "the better" stuff. But I think you'd be well served using GTX, or any other good oil that Walmart has at a good price.

Edward
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Old 10-29-2005, 10:14 AM
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Personaly, with all due respect to Lubemaster....I would like something a bit stronger in terms of proof that Rotella synthetic is bad. What's the issue with this oil ?? "Haven't heard much good"..... might simply mean it's not being talked about,....period. You can't automatically say it's bad based on this statement.

Wil
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Old 10-29-2005, 12:41 PM
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Old 10-29-2005, 12:41 PM
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