What is the best oil for a high mileage 305??
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Senior Member
Joined: May 2001
Posts: 509
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From: N/a
Car: 1986 IROCZ
Engine: LB9....rebuilding coming soon
Transmission: rebuilt 700R4
What is the best oil for a high mileage 305??
One that burns oil on startup and during WOT there is a smell of burning oil after...what is the best one,or are there any additives to help reduce burning oil that ACTUALLY WORK???Cause I cannot afford a broken down engine in the next 6 months,damn colleg
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I got started using AMSOIL while in college (married with two children to boot). I didn't have any engine failures while in college, and I ran at Scribner during those years.
The only potential issues are high consumption due to existing wear and/or hard seals, and a dirty engine when you switch over (petroleum oils will leave sludge and varnish in an engine which synthetics will tend to loosen, contaminating the oil). If compression is good, most likely you just need to change the valve guide seals to keep consumption in control. The sludge and varnish can be flushed before switching to synthetic, or just change the synthetic as it gets dirty.
Even in a worn engine, the typical synthetic is cheap insurance against total engine failure.
The only potential issues are high consumption due to existing wear and/or hard seals, and a dirty engine when you switch over (petroleum oils will leave sludge and varnish in an engine which synthetics will tend to loosen, contaminating the oil). If compression is good, most likely you just need to change the valve guide seals to keep consumption in control. The sludge and varnish can be flushed before switching to synthetic, or just change the synthetic as it gets dirty.
Even in a worn engine, the typical synthetic is cheap insurance against total engine failure.
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