If going by the MM, then yes, you are wasting money;
I maintain (4) vehicles; (3) in my sig and a 2002 Tundra; Each gets long drain capable synthetic oil.
Oil changes then are relegated to warm and sunny weather; OCIs for the vehicles run yearly 8 - 15K miles. If I can't 'get to it for a few weeks' there is little worry; so there is a scenario where money is not wasted.
I maintain (4) vehicles; (3) in my sig and a 2002 Tundra; Each gets long drain capable synthetic oil.
Oil changes then are relegated to warm and sunny weather; OCIs for the vehicles run yearly 8 - 15K miles. If I can't 'get to it for a few weeks' there is little worry; so there is a scenario where money is not wasted.
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