Porsche 911 T

In 1972, a tremendous effort was made to improve the handling of the 911. Due to the 911’s unusual engine placement (rear-mounted, with most of the vehicle’s weight concentrated over the rear axle), early 911’s were prone to oversteer when driven at the limit and could easily spin in the hands of an inexperienced driver. To remedy this, Porsche relocated the oil tank from its position behind the right rear wheel to in front of it. This had the effect of moving the weight of almost 8.5 L (9 US quarts) of oil from outside the wheelbase to inside, improving weight distribution and thus, handling. To facilitate filling of the oil tank, Porsche installed an oil filler door (much like the fuel filler door on the left front fender) on the right rear quarter panel. Unfortunately, this unique design was scrapped after only one year, some say because inattentive gas station attendants were putting gas in the oil tank. The oil tank was subsequently relocated to its original position for the model year 1973 and remained there until it was relocated within the wheelbase for the 964 models.