For 3 months now we have been driving a used Toyota Previa,2.4 petrol engine the newer model year 2000. We bought it privately, because we would have paid double for a comparable vehicle at the dealer. Now, however, there is the problem, that it consumes a lot of oil, every 2 weeks 1L. Our workshop master said it could be either the shaft seal (rep. approx. 500€) or the piston seals (rep. approx. 400€)(I hope that I can now ric the possible diagnoses Has anyone ever had such a problem and had it repaired? Is it more likely that the shaft seal is broken or more likely that the piston seals are broken? Should it be a more frequent previa problem that the shaft seal is broken, I would have a repair done, but is it more likely that the piston seals are broken, I can save myself the effort and would then rather replenish oil regularly, instead of ine 4000€ to have repair done. Please write me your experiences.