And if you use synthetic is it really waste 'oil'?

I like EVOO. California has started producing some really good stuff.

Synthetic every 3k? Why 3k, why not 1k, 2k, or 4k? Why that number? What is so darn magical about 3000 miles? What does Amsoil have to say about this? I would guess, using the logic stated, that a change every 1k would be better. 1k changes would not hurt your engine, so why not change at 1k? If the answer is economics, then why not 4k? I'd like to comprehend the logic.

From www.amsoil.com:
Frequently Asked Questions

Motor Oils

Why are AMSOIL Motor Oils capable of extended drain intervals?

AMSOIL Synthetic Motor Oils are highly resistant to the destructive effects of heat, and do not break down like petroleum oils. This means that AMSOIL Motor Oils can provide much longer drain intervals than conventional lubricants.

Good question. In my engines, thats when the oil typically starts to turn very dark. I also have a buffer in there. I've gone as far as 5K due to being too buisy to change the oil. That rarely ever happens though. I usually change it before 4K.

The key here is that when it's not a nice brownish/yellow anymore, I change it.

BTW, If you think that's too frequent, blown alcohol and up drag engines get an oil change every quarter mile!! :eek:

Perhaps the same way the 3K came about to begin with?

Just where did 3K come from? I have heard that it's 100 hours at 30 MPH average speed.

i would not.

tom w

the water comes from condensation...normally. abnormally from a blown head gasket cracked head or block. the normal kind is more of a problem when driving around town a lot. getting out on the highway heats the oil up and the water boils off. that is why highway miles are considered "easy" and city miles with the stop and go and the motor never getting really warm are considered "severe".

i didn't think there was any oil question that i could be tempted to answer, but here you go.

tom w

I change the oil in my blown 750 hp 572 cubic inch motors every ten hours or so.

But oil turning dark does not mean the additive package has been depleted or the oil has broken down.

I've sent a note to AMSOIL asking them to provide a recomended / suggested oil change interval on a 4 cyl engine:
stock, city only, highway
40% more hp than stock, city only, highway
And the asked if that recomendation changes with V6, L6, or V8 engines.

If they reply, I'll paste whatever their response is. Whatever their answer is, we must remember they are a marketer of the product, and may be slightly biased toward a shorter interval. I am thinking their response will be somewhat unclear, but will definately be higher than 3k in all instances. Let's see, I can't wait!

Oil? We need more of it.

I do 6k oil change intervals.. and have yet to get an analysis. I really need to just to see whats going on in the inside. Plus I will be pulling my oil pan to replace it.

The records show the orginal owner did 10k intervals up til 175k which is when it changed hands... so I know it has had 10k intervals before and the oil pan is OG.. lets see how much crap their is in it

Another oil thread by 240Joe? :sleep1:

Let's talk about something interesting.

Recycling used oil (which everyone should do) is only half of it. It's gotta come from somewhere doesn't it?

That was 240Joe's main argument (I think it's a perfectly valid one), all I'm doing is restating what he's already said.

More like a waste of ethylene and calcium and phosphorus and ......

oh wait...I thought you were asking if it was really wasting "oil" to change it so soon. PAOs are made from ethylene. That was my point.