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post #1 of 42 Old 11-18-2019, 04:01 PM Thread Starter
cpadget
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Oil Type

I’ve read many old threads regarding Rotella. Isn’t it the T4 15w-40 for gas engines, or T4 15w-40 for heavy duty diesels that folks are using?

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post #2 of 42 Old 11-18-2019, 04:56 PM
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The 15W-40 for diesel engines. It is supposed to have more ZDDP than 'gas' engine motor oil. If you have excessive blow-by and still have a cat underneath, it may cause issues due to the additional detergents in the oil not playing nice.

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post #3 of 42 Old 11-18-2019, 05:17 PM Thread Starter
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I don't have any blow by, but do have a cat
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post #4 of 42 Old 11-20-2019, 07:46 AM
firegod33
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No motor oil contains any ZDDP, anymore. Diesel oil contains more zinc but ZDDP has been discontinued by all oil manufacturers. ZDDP is also harmful to cats, for the same reasons it was beneficial to the engine internals. Just use any quality brand of oil, 10w30 or 10w40. You'll be fine.

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post #5 of 42 Old 11-20-2019, 08:24 AM
Matt1981CJ7
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Quote:
Originally Posted by firegod33 View Post
No motor oil contains any ZDDP, anymore.
This is incorrect. When oil manufactures refer to "zinc" they are actually referring to ZDDP, which is zinc and phosphorous. Several oils on the market still have ZDDP. Valvoline VR1 oil is one example. That's what I use in my engine.

Matt


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post #6 of 42 Old 11-20-2019, 08:59 AM
firegod33
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Quote:
Originally Posted by Matt1981CJ7 View Post
This is incorrect. When oil manufactures refer to "zinc" they are actually referring to ZDDP, which is zinc and phosphorous. Several oils on the market still have ZDDP. Valvoline VR1 oil is one example. That's what I use in my engine.

Matt
With the exception of racing oils, what I stated is correct. VR1 is a racing oil.

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post #7 of 42 Old 11-20-2019, 09:29 AM
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Originally Posted by firegod33 View Post
With the exception of racing oils, what I stated is correct. VR1 is a racing oil.
Racing oil is still motor oil, is it not? Many of the so called "racing oils" are street legal for normal everyday use in older flat tappet engines. Amsoil, Mobil 1, etc...are other examples.

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post #8 of 42 Old 11-20-2019, 09:59 AM Thread Starter
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Being in Phoenix and never dealing with cold weather, should I aim for a 10w-40 or 20w-50, rather than something lighter?
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post #9 of 42 Old 11-20-2019, 10:20 AM
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Shell produces T6 Multi-Vehicle for fleet owners that have both diesel and gasoline engines.
Per Shell:
"In order for a diesel engine oil to meet API SN, Shell ROTELLA® T6 Multi-Vehicle 5W-30 is blended with lower levels of phosphorous so it doesn’t damage catalyst systems in gasoline engines. Even still, Shell ROTELLA T6 Multi-Vehicle 5W-30 Full Synthetic has demonstrated excellent wear protection over millions of miles of testing in heavy duty diesel engines."
With no catalytic converter, however, it is OK to use the straight T6.

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post #10 of 42 Old 11-20-2019, 11:18 AM
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I also use the Valvoline VR1 motor oil in the 304 in my '79 CJ5. I use 10W-30 and change it twice a year.

I don't put many miles on my 5 - Maybe 2 to 3 thousand a year.

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post #11 of 42 Old 11-20-2019, 12:32 PM
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I had used vr1 10w-40 until they discontinued it, now I use Brad Penn Penngrade 1. Claims to have high levels of ZDDP, but it's pricey.
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post #12 of 42 Old 11-20-2019, 01:58 PM
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I've been using Schaefer 20W50 which is recommended for flat tappet engines. Was recommended by the engine rebuilder too.
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post #13 of 42 Old 11-21-2019, 07:04 AM
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Quote:
Originally Posted by Matt1981CJ7 View Post
Racing oil is still motor oil, is it not? Many of the so called "racing oils" are street legal for normal everyday use in older flat tappet engines. Amsoil, Mobil 1, etc...are other examples.

Matt
You are correct, however it is a specialty oil. While it is currently, widely available, it isn't necessarily available, everywhere.

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post #14 of 42 Old 11-21-2019, 07:05 AM
firegod33
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Quote:
Originally Posted by Matt1981CJ7 View Post
Racing oil is still motor oil, is it not? Many of the so called "racing oils" are street legal for normal everyday use in older flat tappet engines. Amsoil, Mobil 1, etc...are other examples.

Matt
You are correct. It is, however a specialty oil. While currently widely available, it isn't necessarily available, everywhere.

Quote:
Originally Posted by cpadget View Post
Being in Phoenix and never dealing with cold weather, should I aim for a 10w-40 or 20w-50, rather than something lighter?
I ran regular Valvoline 10w30 for three years, in Phoenix and Lake Havasu with no ill effects.

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post #15 of 42 Old 11-21-2019, 08:35 AM
Matt1981CJ7
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Quote:
Originally Posted by firegod33 View Post
You are correct, however it is a specialty oil. While it is currently, widely available, it isn't necessarily available, everywhere.

So we agree, many oils still have ZDDP, unlike what you said in your first post. As for availability, that's what Amazon is for. Free shipping, and it usually arrives at your doorstep 2 days after ordering.

Matt


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