I have two vehicles which are driven infrequently. Both had an oil change in November 2011. An 87 F150 (4.9 I-6) which when driven, is used to haul something driving 25-50 miles at a time. The other is an 87 Cougar (3.8 V-6)is used for one tank trips 50-150 miles at a time. Both have around 2000 miles on the oil and filter. The oil is clean.Both are stored during winters. Both are rarely used for short trips. Should I change the oil this fall or run for one more year and dump the oil next fall?
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