A transmssion leak will not cause oil to leak inside the timing belt area. Timing belt is in the front of the engine and the transmission is bolted up in the back of the engine. You may have misunderstood the service writer or the service writer did not explain clearly what was going on especially if he really has no clue as to how components work and where they are located. The missing bolt I bet was the one at the corner of the transmission pan which the subframe blocks access too. You really need to have magical fingers and patience to get that bolt back on and if not installed it will cause a small drip towards the back on the drivers side. So there is no way transmission oil is leaking inside the timing belt area since it is sealed up with a cover in the front of the engine (towards passenger side). Now oil leaking in the timing belt area can be engine oil which could be leaking from the cam seals, cvvt hubs, crank seal, oil pump seal, or maybe even an exterenal headgasket oil leak? Number one cause of premature seal wear that will cause an oil leak will be a plugged up pcv sytem. I honestly believe there is a misunderstanding about the 7500 mile service. 7500 mile services should be interpreted as this.
Look at the manuel and it will give you a check list as to what needs to be done correct. Next 7500 mile service you now have 15k miles and it is a more in depth service and so on and so on. Those are major services and can be pretty expensive. But what about in between? You should be doing oil changes in between those services as well. Just a "basic service" so you drive around with the same oil for 7500 miles, and if you just do short trips or sit around stop and go traffic your oil is taking a beating and becomes less effective in lubricating and those pcv fumes do not get hot enough from the short trips that it becomes sludgy and just like poor diet and exercise, the pcv or our arteries start to build up this sludge until it restricts and blocks the passages. Once it is plugged up you build pressure until a seal gives out? You can clean out the pcv system and you will most likely need to replace the oil trap and clean out the sludge out on the block. If you decide to do the repairs, I really do recommend you change the oil every 3000 miles. You can even ask Volvo to change the counter as to when the light should come on. They may charge you to reprogram it? I have rebuilt a few of this engines and it is amazing to see all the sludge that builds up in there and I still can not believe what moron decided to think you can actually go past 3000 miles for an oil change. So really I do not believe they did anything wrong except that they did not properly explain to you as to what the problem really is? If you have any other questions or you need a better explanation do not hesitate to ask.
Sunday, October 31st, 2010 AT 3:45 PM