in some of the old cars people hardly chnaged there oil till is was almost treacle just kept topping it up, oil will degenerate with carbon fuel emissions, getting into it, but if he only drove it (k in 10 years he probably never pushed it hard either. might pay to pout a gallon of flushing oil through it, drive it 10 miles carefully(as thinner than normal oil) to get it through, then change it, then you will have got almost all, if not all of the crap out the system. There was a video of You tube I think many years ago of someone draining the oil out of a car and it was like treacle, whether it was genuine or not I can't remeber, but wouldn't be suprised, as people just didn't change their oil;oops::evil:and then wondered why it broke down etc My Father in law got a new cqar in 1979, and came to visit us one wk end(120miles), and said it ran like a pig once the got halfway(had to slow down). Checked his plugs and they were champion N9Y's (fitted in almost everything at the time)and were between 56-58 thou, should be 25thou, car had done 19k miles, and he wondered why it didn't run well, ;oops:. It had been and had it's service/oil change at 5k, but that was it.