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I have a litle device which plugs into the OBD port and keeps the system live while the battery is changed. Cost a few quid from ebay. On an XF, youm should update the car's system using jaguar Diagnostics. To be fair though I've never heard of any problems if you don't do so.

Hi all...I just thought I would give you all an update on the situation of the 'low oil pressure' 1997 4.0 XK8....I haven't investigated the car itself any further, but I have been doing some research into possible avenues...I intend to follow the advice of Trevor ( given above ) as regards taking readings of oil pressure, compression etc and I will do that before I commit to any work or expenditure on the car.... What I have done is taken the worst case scenario and investigated it...the scenario being that a replacement engine is required. 1..I started at what I consider to be the base or cheapest option....and that is of buying a used engine with no ancillaries....they seem to be available from £500 upwards....there is no history with them, no warranty is offered and they need re-fitting with ancillaries and re-installing....I have determined that fitting the engine is in the region of £500-£1000...the overall cost is in the region of £2000+ 2 I considered a complete engine with known history, and approx 6 months warranty available for approx,£1000...again fitting is in the region of £500-£1000...so the overall cost is again, in the region of £2000.. 3 I looked into having an engine fully rebuilt....I came across either a website or search engine ( im not very computer literate so I am not sure what you would call it ) which allowed you to 'tender' a job and have different companies submit a quote....I received a total of 3 different quotes....they each offered to EITHER provide a fully rebuilt engine or fully rebuild the existing engine...two of the quotes provided for the removal of existing engine, the removal of all ancillaries, the supply and fitting of a rebuilt engine ( with all ancillaries re-attached ) with the existing engine taken on an 'exchange basis'...they were both offered with a 12 month warranty with the following work carried out: • Brand new service parts (Oil Filter & Engine Oil) • Piston Rings • Main Bearing • Con-rod Bearing • Oil Seals • Valve Stem Seals • Head Gas kit • Camshaft Inspected • Timing Chain/Belt Kit • Liner Polishing • Crankshaft Regrinding • Oil Leaks Tested • Crankshaft Front Seal • Crank Shaft Rear Seal • Rocker Cover Gasket • Inlet & Exhaust Manifold Gaskets • Cylinder Head Pressure Testing & Skimming Both companies quoted £4000 total. The company which quoted for a rebuild of the existing engine offered the following: ⦁ Engine will be stripped and all parts cleaned in a chemical bath, engine block will be honed if needed. ⦁ All piston rings are replaced ⦁ Where required; crank is re-polished and re-ground and refitted with new bearing shells (both big end and main) ⦁ The head is pressure tested and skimmed, valves cleaned and re-seated, new seals fitted ⦁ All head and engine gaskets are replaced ⦁ New timing belt or chain fitted (please note extra cost may apply if your vehicle has more than one) ⦁ New water pump (Electric pumps will be charged extra if required) ⦁ Injectors cleaned and tested ⦁ Where applicable; turbo will be removed, tested and cleaned ⦁ Radiator checked and flushed ⦁ Coolant replaced ⦁ Oil and filter replaced Again, a 12 month warranty was offered and the price included the recovery of the car to their premises. The price quoted was £3800. The funny thing is I received a second email from one of the two companies quoting for a rebuilt engine on an exchange basis, and they lowered the quote from £4000 to £3300! I guess they were eager to have the business. Personally, I think either option is good value. If you are going to spend £2000+ on an engine with no or little guarantee of the internals, an extra £2000 or so for what is essentially a brand new engine seems like a bargain to me. Looking at it over the course of 10 or 20 years, it is not a vast amount of money. I shudder to think what 'Jaguar' would charge for a brand new 4.0 XK8 engine. I estimate £10000 plus. Having said that, I could not necessarily justify spending £4000 on the blue XK8. It is not pristine, has no service history, and I only paid a meagre sum for it. On the other hand, should my red XK8 require an engine, I would consider it. It has relatively low miles (114k), a full main dealer stamped service history, lots of receipts and a rust free body and chassis. For now, I plan to carry out a full investigation of the blue XK8's engine and will proceed with 'something' once I know the full picture...I will keep you updated 🙂 Bill