[naz]

Casper,Jun 5 2006, 09:01 PM Wrote:Synthetic isn't just for high output engines. The longer service intervals that it allows is worth it alone. Combine that with superior lubrication, and its a no-brainer. Most people are put off by the initial cost, and can't see the long term savings.
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i'm not sure about 'superior lubrication'. i was under the impression that the viscosity is the same but the sheer resistance of synth is better. the additive package is also different, hard to say if its 'better' or not. i hvae heard better defined as the level of zinc and phosphorus, and i don't think the levels in synth are necessary higher.

one example that comes readily comes to mind is tranny fluid for wrx. general consensus is that the dino OE tranny oil is better (better defined as properly lubricates the tranny) over synth gear oil

as for the longer service interval, i'm not sold. i think we would have to get some oil samples and take a look at the metal levels and compare the % of the additive package left versus a new sample

subaru != ford, but subaru's position was no synth period, and then softened it to full synth but no extended interval changes.

for what its worth, i run dino oil in my bike (only 3k miles) and changed it 3 times already. for my car i run mobil 1 full synth (EGTs in the car are 1450F on highway cruise and oil runs thru the turbo, so i feel better having the synth) and change every 3k miles.. if i had a NA car with low compression i'd be using dino at $2/qt and change every 3k miles