Consequence of switching oils, winter vs summer

[Carlostrece]

Is there potential that I'm actually accelerating wear by alternating additive packages that compete with each other?

Potential, yes. Reality, who knows? Why risk it? There's also another factor to consider: Syn vs Conv oil.

Correct my if I'm wrong. AFAIK 15w40 is conventional oil. 5w40 is synthetic oil. So I think 5w40 would be better year round.

Also, I personally think Shell Rotella 5w40 and Mobil Delvac 5w40 are better than Chevron Delo 5w40. However, Chevron Delo 5w40 is good enough. All of the 5w40 mentioned are better year-round than 15w40, IMO.

 

[wlk]

You are in Virginia and barring a freak sub freeze a 15w40 would be fine. Either would work just fine in your climate. I run 10w40 in PA and for the most part see colder temps in the winter and have had zero problems starting w the 10w40. Just let it warm up for a few minutes before pulling out of the driveway

 

[johnmyster]

Potential, yes. Reality, who knows? Why risk it? There's also another factor to consider: Syn vs Conv oil.

Correct my if I'm wrong. AFAIK 15w40 is conventional oil. 5w40 is synthetic oil. So I think 5w40 would be better year round.

Also, I personally think Shell Rotella 5w40 and Mobil Delvac 5w40 are better than Chevron Delo 5w40. However, Chevron Delo 5w40 is good enough. All of the 5w40 mentioned are better year-round than 15w40, IMO.

I think I've covered the why. Summer towing vs winter cold starting.

No, all of the major players offer a "full syn" 15w-40. Delo XSP, Delvac Extreme, T6.

I am running full syn regardless because I can often buy it for less...even though I realize that the advantages are typically not realized for diesels where long intervals are precluded by soot loading, and even moreso on my conservative intervals.

I'm also not sure you're allowed to say Rotella is better than Delvac is better than Delo and still hang out on BITOG.

In the end sounds like everybody wants to tell me about the weather in my own state and not the original question regarding chemistry.

 

[wlk]

I think I've covered the why. Summer towing vs winter cold starting.

No, all of the major players offer a "full syn" 15w-40. Delo XSP, Delvac Extreme, T6.

I am running full syn regardless because I can often buy it for less...even though I realize that the advantages are typically not realized for diesels where long intervals are precluded by soot loading, and even moreso on my conservative intervals.

I'm also not sure you're allowed to say Rotella is better than Delvac is better than Delo and still hang out on BITOG.

In the end sounds like everybody wants to tell me about the weather in my own state and not the original question regarding chemistry.

Bc the weather is more important than the additives competing against one another. The miniscule amount of leftover oil isn't significant enough to bother with. kschachn stated it in post #6 and JohnnyJohnson stated it best in post #9. I have never seen any motor in my 40yrs of working around vehicles being harmed by switching brand.

 

[johnmyster]

Bc the weather is more important than the additives competing against one another. The miniscule amount of leftover oil isn't significant enough to bother with. kschachn stated it in post #6 and JohnnyJohnson stated it best in post #9. I have never seen any motor in my 40yrs of working around vehicles being harmed by switching brand.

If the weather is more important, then you'll have to argue switching grades with the "just stick with whatever" crowd.

I wasn't asking about the miniscule 1/2 quart that gets left behind.

I was hoping to spark some discussion about tribofilm formation on metal surfaces and if that's constant from one lube to the next and if not, if there's background supporting/against reestablishing it every OCI. But you're right. Anecdotal evidence of someone's surviving beater is what really matters.

 

[Carlostrece]

I think I've covered the why. Summer towing vs winter cold starting.

No, all of the major players offer a "full syn" 15w-40. Delo XSP, Delvac Extreme, T6.

OK.

I am running full syn regardless because I can often buy it for less...even though I realize that the advantages are typically not realized for diesels where long intervals are precluded by soot loading, and even moreso on my conservative intervals.

OK.

I'm also not sure you're allowed to say Rotella is better than Delvac is better than Delo and still hang out on BITOG.

I didn't say Rotella is better than Delvac. I said I personally think Rotella and Delvac are both better than Delo. Saying "I personally think" is the same as saying IMO. I can state my opinion.

In the end sounds like everybody wants to tell me about the weather in my own state and not the original question regarding chchemistry.

My entire first paragraph addressed your question about mixing additive packages as well as it can be addressed. I didn't mention the weather in your state.

You asked a question and then berated the people who answered you with helpful intentions. Use whatever you want.

 

[ripcord]

Virginia barely gets below freezing all year long. There's no reason you can't run 15w-40 all year round!