Ultimate Motor Oil Thread or Why we hate CJ4/SM oils

[Jerome74911S]

This thread is approaching 100 pages according to my computer. This is beyond mind-boggling, so I've decided to switch to extra virgin olive oil. Mainly I like the virgin part and, anyway, the engine will likely last as long on this as it would with some of the witch's brews people toss in there.

[SilberUrS6]

Originally Posted by Jerome74911S

This thread is approaching 100 pages according to my computer. This is beyond mind-boggling, so I've decided to switch to extra virgin olive oil. Mainly I like the virgin part and, anyway, the engine will likely last as long on this as it would with some of the witch's brews people toss in there.

But does that extra virgin prevent tappet wear?

And where in the heck does one find "virgin", let alone an extra one? Sounds like you'll need the unicorn tears additive.

[Jerome74911S]

No worries. I bought some of that ZDDP additive, so this should take care of the flat tappets. Also, it's good on popcorn.

[333pg333]

Originally Posted by j911brick

maybe we did. Most people don't own a car long enough to wear out the motor; and most people don't participate in a oil analysis program so they have no idea if they are doing damage to the motor.

Still inclined to think we'd have masses of information to show that this actually happened.

[wasserkuhl]

Originally Posted by 333pg333

Still inclined to think we'd have masses of information to show that this actually happened.

On forums all over the world the debate continues.

Reminds me of the Religion vs Evolution debate.

Synthetic oils have their place for long drain interval modern cars ( not for my modern cars though..)

All I know is Give me a Dino oil anyday for an older Porsche, with short Drain and filter intervals........

Works for me and I don't have to woory about major engine failures. Haven't had one yet.

[bryvincent]

does anyone use Motul Classic 20W50? its a dino oil rated API SF/CC so i assume it has adequate ZDDP. while its still expensive for a dino oil, its about half the price of the Motul 300V.
Or is the Motul 6100 15W50 synthetic API SL/CF a better option?

All Products — Catalog Products — CLASSIC OIL 20W50 2L | Motul
All Products — Catalog Products — 6100 SYNERGIE 15W50 5L | Motul

[bryvincent]

oops.

[Nick Triesch]

My 85 911 has had castrol 20/50 for almost it's entire life. (records) I switched to Valvoline VR1 on my last oil change. My car has 143,000 on it now and passed smog last 7 checks and runs great. Dang, I hope the motor is not ruined!!!Glory be to the VR-1, the Deep purple and the holy Brad Penn amen.

[MrBonus]

Is there an appreciable difference between Swepco 15W40 and 20W50 for a 72,000 mile '89 driven in the Mid Atlantic/North East area? I'm about to order some oil and I can't make a decision between them.

[wasserkuhl]

Originally Posted by MrBonus

Is there an appreciable difference between Swepco 15W40 and 20W50 for a 72,000 mile '89 driven in the Mid Atlantic/North East area? I'm about to order some oil and I can't make a decision between them.

look in your owners manual and there is a little chart that will guide you to the weight to use for your climate.

I would be using 20W50 as I am in a warmer and not cold climate

[MrBonus]

Originally Posted by wasserkuhl

look in your owners manual and there is a little chart that will guide you to the weight to use for your climate.

I would be using 20W50 as I am in a warmer and not cold climate

I have and either fit the temperature profile of my region. I was wondering if one had superior additives for our motors compared to the other or if it doesn't make a difference.

[HarryD]

Originally Posted by MrBonus

Is there an appreciable difference between Swepco 15W40 and 20W50 for a 72,000 mile '89 driven in the Mid Atlantic/North East area? I'm about to order some oil and I can't make a decision between them.

I would only expect the only difference to be the weight. The additive pack should be the same. This appears to be confirmed by the product data you can access from this web page: SWEPCO 306 Supreme Formula Engine Oil | Southwestern Petroleum Corporation [Click on the Technical Data Tab at the bottom of the page and open up the .pdf file called "swepco_306_supreme_formula_engine_oil_sales_brochu re_j08346.pdf"].

As noted by others, you will need to decide what weight is appropriate for your climate and use. FWIW, I always use 20-50W in Portland Oregon.

[j911brick]

Originally Posted by MrBonus

I have and either fit the temperature profile of my region. I was wondering if one had superior additives for our motors compared to the other or if it doesn't make a difference.

You shouldn't use additives in your oil.

[HarryD]

Originally Posted by j911brick

You shouldn't use additives in your oil.

James, I think he was asking about the additives that at included in the oil not additional ones the end user might add.

[cnavarro]

Originally Posted by HarryD

I would only expect the only difference to be the weight. The additive pack should be the same. This appears to be confirmed by the product data you can access from this web page: SWEPCO 306 Supreme Formula Engine Oil | Southwestern Petroleum Corporation [Click on the Technical Data Tab at the bottom of the page and open up the .pdf file called "swepco_306_supreme_formula_engine_oil_sales_brochu re_j08346.pdf"].

As noted by others, you will need to decide what weight is appropriate for your climate and use. FWIW, I always use 20-50W in Portland Oregon.

The only differentiation I make between the two is the 15w40 is good for ambient air temps up to about 90F and the 20w50 should be used above 90F.

I wouldn't use the 20w50 for cold starts regularly under 32F.

[wasserkuhl]

Originally Posted by cnavarro

The only differentiation I make between the two is the 15w40 is good for ambient air temps up to about 90F and the 20w50 should be used above 90F.

I wouldn't use the 20w50 for cold starts regularly under 32F.

What is the possible negative consequence of using 20w 50 below 32f? ie: damage?

[cnavarro]

Yes, damage, as the oil gets too thick to flow properly.

[NathanUK]

Originally Posted by j911brick

You shouldn't use additives in your oil.

What's wrong with adding additives ourselves to our oil?

Have I missed something?

[RWebb]

adding your own can upset the balanced package of additives that a group of experienced chemists and engineers designed for the oil

[NathanUK]

I agree. What about adding ZDDPlus though?
http://www.zddplus.com/