Toro Tinecutter 75755 (Toro Engine) ordering oil and filter kit for the mover its always 2 qts and filter. But manual calls for 81oz (2qts 64 oz thats 17 oz shy). When adding only 2 qts its 1/3 low on the dipstick fill mark. Is this normal only using 2 qts of oil. My first oil change I drained...