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I would say switch now to syn, document any leaks you have (you should have none) then see how your mpg changes and if any leaks develope. If none then continue using it.

 

I generally wait for advance auto to have mobil1 or valvoline on sale during the oil change specials, 35 dollars for 5.1quarts and a mobil1 filter (or 25 with crap filter) just buy a years worth

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maybe I should switch.....but after 118K would it do more harm than good?

 

Before synthetic around 110k it used to burn maybe 0.5 qt between oil changes (3k). After synthetic I started adding 1 qt between oil changes (5k-7k). Then I had to dump 4 qt between synthetic changes. It was gradual. Then I switched to dino before covering the cats with oil but it didnt help. Now I dump 1 qt after 1500 miles and at 3k it is below L.

 

Long story short, I will never switch to synthetic again on a high mileage car.

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Saint, do you have any oil leaks? In the spark plug wells?

 

Wouldn't that cause a lot to be "burned up"?

 

Yes I have oils at some plug wells. However that leak is very slow. The main leak is at valve seats. Thats why if it sits too long it smokes at first. Compressor has the typical mist on the walls, nothing excessive.

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on a related note, I found the seller I received my green silicone vacuum tubing from. autobahn88 on ebay. Got 30ft for something like 40 dollars shipped.

 

It's thicker then standard tube but is almost a neon green not the crappy pine tree green.

 

This combined with machine brass t's will last forever

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