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Oil change or not - Printable Version

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Oil change or not - mpbsr - 03-31-2018

The 302 engine had a total rebuild about 3.5 years ago and I've been using Mobil 1 full syn.

I usually change the oil each spring at about 1000 miles per year.

Not that I want to be cheap, but does it really need an oil change or am I good
at least for another year 1000 miles?

Thanks


RE: Oil change or not - Canted 393 - 03-31-2018

Whats the color, or whats the odor like, do you have a lot of idle time on the motor? 
Is it stored inside a climate controlled garage? If it looks good and doesn't have a gassy smell to the oil run it. But when in doubt drop it, they make more.


RE: Oil change or not - kcmash - 03-31-2018

The unseen problem with the oil is the amount of condensation and opportunity for the oil to break down as it sits.  So I usually say you should change if you have had a lot of start up and idle time over the year even though the mileage is not high,

I did learn in the engineering world that the oil formulations have changed over the years, so we are kinda stuck with more expensive oils for our older flat tappet engines.  Make sure you are using a good quality racing or high sulfur content oil to protect you cam from breakdown.

Maybe you already knew that though.

kcmash


RE: Oil change or not - midlife - 03-31-2018

Sulfur? I think you mean ZDDP or phosphorus in the oil is needed for our flat tappet cams.


RE: Oil change or not - mpbsr - 03-31-2018

Christine is garage kept but not climate controlled.

I usually take her out at minimum for a 30 minute ride, at least once a month, even during the winter.

Pulled the dip stick and the oil still had that yellowish/gold color on the stick with no gas smell, but to play it safe prob better to just change it.

Thanks


RE: Oil change or not - 73pony - 03-31-2018

I would change it. As mentioned above condensation will form and breakdown the oil. Better safe than sorry.


RE: Oil change or not - sicndhed - 03-31-2018

(03-31-2018, 12:50 PM)kcmash Wrote: The unseen problem with the oil is the amount of condensation and opportunity for the oil to break down as it sits.  So I usually say you should change if you have had a lot of start up and idle time over the year even though the mileage is not high,

I did learn in the engineering world that the oil formulations have changed over the years, so we are kinda stuck with more expensive oils for our older flat tappet engines.  Make sure you are using a good quality racing or high sulfur content oil to protect you cam from breakdown.

Maybe you already knew that though.

kcmash

IIRC, Sulfur is added to gear oil to aid their ability to prevent wear in high psi loads faced by gears.  It is also a problem in engine oil as it promotes formation of acid when exposed to combustion byproducts.


RE: Oil change or not - Stanglover - 03-31-2018

Question; why use synthetic oil in these engine at all? When I had my engine rebuilt I was expressly told NOT to use synthetic oil, ever. Also NOT to use synthetic gear oil either.  I'm no mechanic or tech guy, but the reason given was synthetic is meant to be used in engines with tighter tolerances like modern engines. It is also an expensive product. I know many do run synthetics and there will always be pros and cons......... and heated discussions!! 
My choice has always been Castrol 10W30 conventional oil with ZDDP added and even that is not really necessary once the motor is broken in correctly, again according to the engine builder. And yes, I change it every spring, no matter what the mileage, for about 20 bucks plus a Fram filter.


RE: Oil change or not - Canted 393 - 03-31-2018

Stanglover please use a different brand of oil filter, fram is at rockbottom for quality.


RE: Oil change or not - NOT A T5 - 03-31-2018

Geoff, I've heard from my engine builder FRAM oil filters to be the worst!