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im going to change the oil of my friends 05 gs300 and we need to know how many quarts to use. he bought the car used and it didnt come with a manual. i tried searching but only found answers for the gs400 which was 5.5-6 quarts.
Some shops require the procedure of pre-filling the filter first, and then filling up the engine afterwards. They give both specs for that reason
I don't know or remember what the true purpose of that is. It was something that my father told me to do when I first started to change oil and have been doing so ever since.