Thread: Break in oil

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Originally Posted by DennyW

I run Castrol in the wifes car, and my motor cycle. Very good results. I use Havoline in my Merc engine. Stays clean as a whistle.

If you want some hands on experience from oil. I'll give you one. This is how ever a few years back. My previous brother-in- law had a Chevy pickup. He changed oil every 5,000 miles. He used the high dollar Mobile 1 oil. He was getting oil pressure errattic readings. He asked if I would take a look at it. I did. I pulled the valves covers. You have to remember now, he did a lot of starting and stopping, but did go on the road some times, which that may have been the reason, but I filled a McDonalds medium coke cup to the top from cleaning both heads around the valve train. It was like Goooy paste. It reminded me of the old Non Detergent oils, how they would build up. Except this had the gritty feel along with it. I had to pull the oil pan, and clean that, and the oil pump screen. He asked if he should switch oil, and I said no. All you will do is flush all that, and get troubles again. Soon after he traded it.

ps: From the ratings on their site.
Engine Oil
Castrol GTX
API* 5W-20 - Maximum Protection Against Viscosity and Thermal Breakdown

Product Data Sheet




Castrol SYNTEC
API* 5W-20 - Outperforms ALL Leading Motor Oils

Product Data Sheet




Castrol SYNTEC BLEND
API* 5W-20 - Added Protection for Frequent Short Trips

Denny,if your former brother in law had a lot of starting and stoping maybe the 5,000 was more like 7,500. In other words we could go by an hour meter instead of miles.

Originally Posted by DennyW

Well, even so, it said 10,000 mile oil change intervals then.

I feel that like STP, when you heat and cool things, your buildup also does the same thing. Just keeps adding layer after layer.

It is kind like engine insulation.