More oil info
The last time there was a big change in oil formulation was mid-2005. Anything with the starburst on the bottle and 30w or less (0-30, 5-30, 10-30)is the new formulation (GF4 rating). That includes petroleum, blends and syns. The GF3 rating is the old formulation. Some OLD bottles may have the starburst and be the GF3 rating. Those have most likely been circulated out of stock by now. New law states that if the oil does not meet GF4, no starburst allowed. The heavier weight oils maintain higher levels of the old additives. The new formulations are not void of EP additives. New, more expensive EP additives were developed and are in the new formulations. There effectiveness is still up for debate.
Racing oils are heavy in EP additives, but in some brands detergent additives are non-existant. It is assumed racing oil will be changed often so the need for detergents is not important.
The last time there was a big change in oil formulation was mid-2005. Anything with the starburst on the bottle and 30w or less (0-30, 5-30, 10-30)is the new formulation (GF4 rating). That includes petroleum, blends and syns. The GF3 rating is the old formulation. Some OLD bottles may have the starburst and be the GF3 rating. Those have most likely been circulated out of stock by now. New law states that if the oil does not meet GF4, no starburst allowed. The heavier weight oils maintain higher levels of the old additives. The new formulations are not void of EP additives. New, more expensive EP additives were developed and are in the new formulations. There effectiveness is still up for debate.
Racing oils are heavy in EP additives, but in some brands detergent additives are non-existant. It is assumed racing oil will be changed often so the need for detergents is not important.