CaramaC

This is a long shot, but l thought l would post. . l have a 53 VW Sharan TDI and not long after l bought it (nearly 2 years ago now) l had a similar sounding problem). Anyway it was driving me nuts but one day l took a look under the car to see if l could see anything amiss and l noticed that the exhaust heatshield was bent and pressing hard against the middle box on the exhaust restricting its movement on its rubber mountings. Went out for a drive and bingo, the problem had gone. The heat shield is only made of flimsy stuff and several weeks later the problem re appeared and it was the same thing again. What l think was/is happening is when we have had heavy rain, water is propelled up from the nearside front wheel (from deep puddles at the edge or the road) at a rate of knots and it hits the heatshield (also on the nearside) bending it and causing it eventually to jam against the middle exhaust box. Probably l was only getting the heavy shuddering on acceleration because the engine moving on its mountings but the exhaust couldn't move freely causing the shudder.........like l said, a long shot, but you never know....sorry for rambling on a bit

Quantum spec 505.01 VW approved for PD Diesel engines, you can usually get it from VW Dealers. Cost about 28 quid including a new filter. Changed about every 7k miles.

Not sure exactly but l've got the 130bhp TDI Sharan and that takes roughly 4.5 litres