Is it too soon for synthetic

[Classic_LS]

I recently freshened up my motor with new ring's, bearing's, head gasket's, no machine work, just honed the cylinder's. I now have 500 mile's on it, and need to change the oil. I'm wanting to run Mobil 1. Is it too soon for synthetic. If so, what oil would you guy's recomend. I've read alot of guy's are using Rotella. Would that be a good break in oil. Thank's.

BTW. It's a 95 Chevy truck with a 5.7
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[webfors]

+1 on the Rotella. 10w30 HDEO would be a good choice now and for the future.

 

[gathermewool]

What's your reason for wanting to go Synth? What kind of service?

 

[daves87rs]

Originally Posted By: gathermewool
What's your reason for wanting to go Synth? What kind of service?


+1

 

[Classic_LS]

Originally Posted By: gathermewool
What's your reason for wanting to go Synth? What kind of service?


It was a no-budget rebuild. I didn't hot tank anything. The motor was very neglected when I got it. I actually pulled it when I was having my trani rebuilt. It had major oil leak's, and some freeze plug's leaking. So I was just going to re-gasket it. But one thing lead to another, and I couldn't stop myself. But the money ran out. I'm just wanting to try and clean it up internaly with synthetic oil. And admititly, I'm guilty of not changing my oil as often as I should. So I figure I can go a little longer on oil change's.

 

[turbovanman]

As I just in another break in thread, use conventional oil for 3000 miles or 5000 km's to assure proper ring seating, then you can switch to synthetic oil.

 

[Steve S]

I would do a couple of conventional oil changes to flush the breakin crud out.

 

[heypete]

From Mobil's website

Quote:
You can start using Mobil 1 in new vehicles at any time, even in brand new vehicles. In fact, Mobil 1 is original equipment (it is installed at the factory) in:


* Acura RDX
* Aston Martin
* All Bentley Vehicles
* All Cadillac Vehicles
* Chevrolet Corvette C6 and Z06
* Chevrolet TrailBlazer SS
* Chrysler 300C SRT-8
* Cobalt SS S/C Coupe
* Dodge Caliber SRT-4, Charger SRT-8, and Magnum SRT-8
* Jeep Cherokee SRT-8
* Mercedes-Benz AMG Vehicles
* Mercedes SLR
* Mitsubishi Evolution
* Pontiac Solstice GXP
* All Porsche Vehicles
* Saturn Ion Red Line and Saturn Sky Red Line
* Viper SRT-10

One of the myths surrounding synthetic oils is that new engines require a break-in period with conventional oil. The fact is, current engine manufacturing technology does not require this break-in period. As indicated by the decisions of the engineers who design the high-performance cars listed above, Mobil 1 can be used starting the day you drive the car off the showroom floor.


In short, I don't think there's any reason why you shouldn't be able to switch to synthetic at any mileage you wish.

If the engine is all cruddy, perhaps running the Mobil 1 High Mileage stuff for a little while might be useful? According to the bottle, it has more cleaning agents and can help remove gunk from the engine.

 

[snakyjake]

Mobil pretty much proved that synthetics don't offer reduced friction when compared to today's modern conventional oils.

Or, today's engine's don't need the same kind of break-in as they did in the past.

 

[Durango]

Originally Posted By: Classic_LS
Originally Posted By: gathermewool
What's your reason for wanting to go Synth? What kind of service?


It was a no-budget rebuild. I didn't hot tank anything. The motor was very neglected when I got it. I actually pulled it when I was having my trani rebuilt. It had major oil leak's, and some freeze plug's leaking. So I was just going to re-gasket it. But one thing lead to another, and I couldn't stop myself. But the money ran out. I'm just wanting to try and clean it up internaly with synthetic oil. And admititly, I'm guilty of not changing my oil as often as I should. So I figure I can go a little longer on oil change's.



classic_LS,

You did the right thing in rebuilding your engine that way. Oil leaks are the wrose thing to neglect in any motor. It obviously was worn out so that's why it had leaks.

If I was in your shoes I would NOT run any synthetic oil in your engine until your sure the motor is working fine as the way you want it. Try using Mobil conventional first for the first 3K and then change it out to maybe Mobil "Clean" as it's a blend. Then run that until the next OCI is ready 6K. At 6K then change it over to the synthetic oil of your choice.

Regardless of the type of oil you choose too me the main thing is if you drive low miles per week then I usually on a weekend take my truck out on the highway for about hour or two to get that oil hot so all the moisture is gone. That way you don't delelope ant sludge issues although with the price of gas now a days it can be expensive.

Since you drive a Chevy truck most likely you need to use either a 10w30 or 5w30 is usually what GM prescribes. I would not use that fancy new Mobil 1 0W-20 oil. Too light for your 95 truck.

The main thing is to use a good quality oil filter.


Durango