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Originally Posted by sideways danny
castrol RS loses it's viscosity after about 2k,
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I change my oil at least every 2k anyhow or soon as its not clear on my dipstick
.But if it only breaks down to 10-50 then its not going to cause any problems. Sxoc prove castrol wrong. Sxoc really must have a lot of paid members
After further thought though 10-50 is probably the best choice for the ca engines but i dont think Castrol RS is going to do any harm at all and is still a top choice of oil