Should heat be an issue for a 15w40?

[aco]

I run an engine that biulds up a lot of heat(toyota 4AGE 16V), because of economic reasons i cant afford a synth oil and my only viable choices are 20w50 and delo 15w40, by all the reading in this forum i decided to go with the delo, now summer is coming and with the AC on almost all the time i wonder if the 15w40 is going to have any problems handling all that heat, or if i should go for a 20w50 for summer.
As always thks for all your help

 

[Mr Magoo]

Delo 400 would be an excellent alternative to synthetic oils.

 

[AndyH]

quote:

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Originally posted by aco:
... now summer is coming and with the AC on almost all the time i wonder if the 15w40 is going to have any problems handling all that heat, or if i should go for a 20w50 for summer.

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Summer is coming... *confused*. Don't you mean winter? (granted, winter in West Palm Beach is probably pretty mild compared to the rest of the U.S.)

 

[buster]

Have you considered the cost/benefit of using a synthetic and going longer drain intervals? To answer your question, it depends on the engine and oil type. Some oils reduce friction better then others.

 

[Bob Miller]

Motorcraft 5w-30 HTHS of 3.2 or Havoline 5w-30 HTHS of 3.1 would be my recommendation.

Both have excellent UOAs.

 

[texasproud]

Delo 400 does me a fine job in 2 pickups and 2 diesel tractors year round. He77 is air conditioned compared to this place !! Great price as well.

 

[Mr Nice]

I live in Palm Beach and there is no such thing as 'winter' down here. A couple of cool nights, but thats it. Delo is a great oil if you want the performance of Syn oil, without the cost.

 

[Mitch Alsup]

My guess is that Toyota specifies a 5W-30 or 10W-30 oil for that engine. So unless you are running the snot out of the engine or visiting race tracks often, you should be able to stick in grade, so to speak.

If you go to the oil data page at this sight, look for an oil with a high number in the operating temperature column (say greter than 11.7 for xW-30). Then based on all the oils you find with high operating viscocities, take the oils with the lowest startup numbers and highest HTHS numbers.

My guess is that you can stay in grade and still protect the engine from the abuse you want to throw at it.

If, by the way, you are running the snot out of the enigne on race tracks, then weigh the HTHS number above the cold start number. (And get an oil temperature guage).

 

[Jimbo]

The BMW runs real hot, oil temps always well above 200F, and Delo 400 has produced the best results, even compared to 20W-50 Castrol Syntec blend. The tradeoff is that thinner oils theoretcally run cooler, but flashpoints, and therefore oxidation resistance and volitility rating is still better with thicker grades. Delo has lots of ZDDP and moly for oxidation resistance, as well as a 468F flashpoint.

 

[Mr Nice]

Jimbo,
What type of BMW do you have ??

 

[aco]

Thanks for the replies, i forgot to mention im in Lima- Peru now, that´s why i said summer was coming..i was looking for a 10w30 yesterday and i was unable to find any,,,the only grades available are 20w50 and 15w40..weird thing they dont have more choices!!!
Based on the replies i´ll stick with the delo
thks

 

[Al]

I think if you can afford $3.00/gallon of gas. Any difference in oil's cost is chump change.

 

[Jimbo]

LT4 Vette,

1992 325i 5-speed