I just drained the oil on a 2008 tundra 4.7L. I have 7 quarts of Pennzoil Platinum 5w20, but just realized that the oil cap does not specify 5w30 or 5w20, just 5w30. The toyota oil chart says it's ok to use 5w30 or 5w20, could I use the 5w20 for an OCI? It has 106k miles on it.